World TeamTennis (WTT) is a mixed-gender professional tennis league played with a team format in the United States, which was founded in 1974.

The league's season normally took place in the summer months. Players from the ATP and WTA would often take a break from their tour schedules to partake in World TeamTennis.

WTT was the first professional sports league to grant equal status to each man and woman competing for their teams.

Many top tennis players have participated in the league over the years, including Billie Jean King, Rod Laver, Björn Borg, Ilie Nastase, Chris Evert, John McEnroe, Evonne Goolagong, Jimmy Connors, Martina Navratilova, Andre Agassi, Pete Sampras, Michael Chang, Serena Williams, Venus Williams, Lindsay Davenport, Kim Clijsters, Martina Hingis, John Isner, Sam Querrey, Sloane Stephens, Naomi Osaka, and Frances Tiafoe.

WTT has not hosted any matches or tournaments since 2021, but has since announced plans to relaunch in December 2026.

Format Originally played on a no-line court, each match consisted of five sets. Each set featured a different configuration (men's singles, men's doubles, women's singles, women's doubles, and mixed doubles). Prior to each match, coaches would decide the order in which the sets would be played. Each player on a team usually played in at least one of the five sets. Scoring was no-advantage; there was no requirement to win a game by two points; at deuce, whoever scores the next point wins the game. The first team to reach five games wins each set. A nine-point tiebreaker is played if a set reaches four-all. One point is awarded for each game won. If necessary, extended play and a supertiebreaker were played to determine the winner of the match.

The original league format included a four-colored tennis court, a 44-contest season, and teams of at least two men and two women. A match consisted of the first player or team to win five games, with a nine-point tiebreaker at four-all, and no-ad scoring in women's singles and doubles, men's singles and doubles, and mixed doubles.

Courts For much of World Team Tennis' history, its distinct court was an instant symbol for fans to recognize what they were watching. The iconic four-color (calico) court originated in the early 1970s and was unveiled for the third season in 1976. It was originally created to eliminate court lines (no-line court). Originally, the service boxes were blue and green, the baseline area brown and the doubles alleys maroon. These colors were chosen to represent the different tennis court surfaces: green for grass, blue for hard, maroon for clay and brown for dirt.

The league's technicolor playing surface served as a trendsetter for the rest of the tennis world. The Indian Wells Masters has purple courts.

Over time, lines were introduced to WTT's courts, purple replaced the brown and they reverted to traditional solid-colored courts. But in 2006, the league returned full-time to the signature calico/checkerboard pattern.

In 2019, the league made efforts to modernize and update its look and branding, including a switch to a deep blue playing surface and gray outer court. In partnership with DecoTurf, these colors were determined to be the best for livestreaming and television.

First league

Founding WTT was founded in 1973 by Dennis Murphy, Dick Butera, Fred Barman, Jordan Kaiser, and attorney and promoter Larry King, each of whom organized and owned the various participating teams of the fledgling professional tennis league. Murphy had previously founded the World Hockey Association, and gave a number of WHA club owners preferential options on WTT franchises.

Charles "Chuck" Reichblum (now popularly known as "Dr. Knowledge"),McCoy, Adrian "Person of interest: Charles Reichblum (Dr. Knowledge)", Pittsburgh Post-Gazette, January 15, 2012. Retrieved September 24, 2018. industrialist John H. Hillman III, and lawyer William "Bill" Sutton, who became the owners of the Pittsburgh Triangles, had, in 1972, founded the similar National Tennis League (NTL), a forerunner to WTT and Reichblum's brainchild. Founding members of WTT were reported to have been invited to join the NTL prior to formation of the competing WTT in 1973.AP "Plans for Pro Tennis League", The Daily Times, Salisbury, Maryland, October 5, 1972, page 20. Retrieved September 24, 2018.Shrum, Rick "Love Triangles: Pittsburgh adored its World Team Tennis franchise", Pittsburgh Post-Gazette, September 10, 2000. Retrieved September 24, 2018.

Teams, 1974–1978 In 1974, Billie Jean King began the first WTT season by securing the professional women tennis players. Arthur Ashe and Wilt Chamberlain helped to secure the professional men tennis players. Two WTT players, Connors and Goolagong, were not allowed to participate in the 1974 French Open due to their associations with WTT. Connors' exclusion from the French Open denied him the opportunity to become the first male player since Rod Laver to win all four Major singles titles in a calendar year.

The league began play in May 1974, with George MacCall as Commissioner of the 16 teams, many with tennis-themed nicknames. The Eastern Division consisted of the Atlantic Section: Baltimore Banners, Boston Lobsters, New York Sets, Philadelphia Freedoms; and the Central Section: Cleveland Nets, Detroit Loves, Pittsburgh Triangles, Toronto-Buffalo Royals. The Western Division consisted of the Gulf Plains Section: Chicago Aces, Florida Flamingos, Houston E-Z Riders, Minnesota Buckskins; and the Pacific Section: Denver Racquets, Hawaii Leis, Los Angeles Strings, San Francisco Golden Gaters.

Following the initial 1974 season several teams moved, folded, or failed to meet the financial requirements of the league, and the league also added one expansion team, the San Diego Friars. For the 1975 season World Team Tennis consisted of 10 teams, and it remained with that number of teams throughout the rest of the existence of the first league.

The teams that played from 1974 to 1978 were: Boston Lobsters (1974) Chicago Aces (1974) Cincinnati (never played) / Cleveland Nets (1974–1976) / Cleveland-Pittsburgh Nets (1977) / New Orleans Sun Belt Nets (1978) Dallas (1979 expansion franchise – never played) Denver Racquets (1974) / Phoenix Racquets (1975–1978) Detroit Loves (1974) / Indiana Loves (1975–1978) Golden Gate Otters (never played) / San Francisco Golden Gaters (1974–1978) Houston E-Z Riders (1974) Los Angeles (1979 expansion franchise – never played) Los Angeles Strings (1974–1978) Minnesota Buckskins (1974) New York Sets (1974–1976) / New York Apples (1977–1978) References both "Sets" and "Apples". Pennsylvania Keystones (never played) / Soviet National Team (1977, often simply called "The Soviets") / Anaheim Oranges (1978) Philadelphia Freedoms (1974) / Boston Lobsters (1975–1978) (Elton John, a friend of Billie Jean King, wrote the hit single "Philadelphia Freedom" as a theme song for his favorite team.) Phoenix (never played) / Baltimore Banners (1974) Pittsburgh Triangles (1974–1976) St. Louis (never played) / Florida Flamingos (1974) San Diego (1979 expansion franchise – never played) San Diego Friars (1975–1978) San Diego Swingers (never played) / Hawaii Leis (1974–1976) / Sea-Port Cascades (1977) / Seattle Cascades (1978) Toronto-Buffalo Royals (1974) / Hartford Royals (never played)

WTT was the first professional sports experience for Jerry Buss (eventual owner of the NBA's Los Angeles Lakers and the NHL's Los Angeles Kings), and for Bob Kraft (eventual owner of the NFL's New England Patriots and MLS's New England Revolution).

All-star games and MVPs WTT also held annual All-Star games for the seasons from 1975 to 1978. Marty Riessen (Cleveland) and Greer Stevens (Boston) won Most Valuable Players (MVP) honors for the inaugural all-star gala won by the East, 28–21, at the Inglewood Forum in Los Angeles. In 1976 the West All-Stars, led by Chris Evert and Betty Stöve, capped an incredible comeback when they defeated Billie Jean King and Evonne Goolagong in a super tiebreaker, 5–4, giving the West a stunning 28–27 overtime victory at the Oakland–Alameda County Coliseum. After trailing at one stage by 24–17, the West, led by Stove and Dianne Fromholtz, won the final set plus two games in overtime to draw the West All-Stars even at 27. Tom Okker (San Francisco) and Dianne Fromholtz (Los Angeles) won MVP honors that year. In the 1977 All Star Game held at the San Diego Sports Arena, Björn Borg (Cleveland–Pittsburgh) and Betty Stöve (Seattle–Portland) captured MVP awards as the East bested the West, 23–18. WTT held its final All-Star event in Las Vegas in 1978.

Ending The first league ended play in 1978.

Second league

1981–1991 League play resumed in 1981 as TeamTennis, with four California teams, expanding to eight teams in 1982. In 2005, the league had twelve teams.

In 1984, Billie Jean King became Commissioner and major owner of the league, following her retirement from tournament tennis competition.

In 1985 a recreational league for non-professionals was added, which was co-branded with the professional league.

1992–1999 In 1992, the name of the league was changed back to World TeamTennis. Minnesota Penguins, 1993 Idaho Sneakers, 1994–1997 New Jersey Stars, 1987–1995 (relocated and became the Delaware Smash) Phoenix Smash, 1992–1994

2000–2021 In 2000 the current logo was adopted. In February 2001, Billie Jean King retired as commissioner and Ilana Kloss became the new commissioner.

In 2005 and 2006 the league consisted of 12 teams and in 2007 the Hartford FoxForce ceased operations. Prior to the 2008 season, the Houston Wranglers ceased operations and the Washington Kastles joined the league. In the 2009 season, 10 teams competed: Boston, New York Buzz, New York Sportime, Philadelphia, Washington, D.C., Kansas City, Newport Beach, Sacramento, Springfield, and St. Louis. Sacramento won the year-end championship six times.

Before the start of the 2011 season the New York Buzz and the New York Sportimes merged into one New York team, the Sportimes."New York Sportimes to Play Two WTT Matches in Albany This Summer As World Team Tennis' New York Teams Consolidate" http://www.wtt.com/page.aspx?article_id=2411 During the 2011 season the Washington Kastles completed a perfect 16–0 schedule, winning their second championship in three seasons.

In 2012, the Washington Kastles completed their second consecutive perfect season, going 16–0 for the second season in a row to become the first professional sports franchise to go two complete seasons without a loss. Their 32-match winning streak is one shy of the major professional sports record of 33 consecutive wins set by the 1971–72 Los Angeles Lakers of the National Basketball Association. They began the next season with 2 wins making their streak 34 games, setting the new record.