The Professional Squash Association (PSA) is the governing body for the men's and women's professional squash circuit. The body operates in a similar fashion to the ATP and the WTA for tennis. The PSA's highest professional level, the PSA World Tour involves over 250 tournaments annually around the world. Over 1,200 players from five continents are registered with the PSA and rankings are updated monthly based on players' performances.
The Challenge Tour, also sometimes referred to as the European Challenge Tour, is the second-tier men's professional golf tour in Europe. It is operated by the PGA European Tour and similarly with the main European Tour and the European Senior Tour, some of the events are played outside Europe.
The ATP Tour is the sole worldwide top-tier tennis tour for men organized by the Association of Tennis Professionals founded in 1990 that replaced the earlier dual Grand Prix Circuit and WCT Circuit. The second-tier tour is the ATP Challenger Tour and the third-tier is the ITF Men's World Tennis Tour. The equivalent women's organisation is the WTA Tour.
The ATP Challenger Tour, known until the end of 2008 as the ATP Challenger Series, is a series of international men's professional tennis tournaments. The Challenger Tour events are the second-highest tier of tennis competition, behind the ATP Tour. The ITF World Tennis Tour tournaments are on the entry-level of international professional tennis competition. The ATP Challenger Tour is administered by the Association of Tennis Professionals. Players who succeed on the ATP Challenger Tour earn sufficient ranking points to become eligible for main draw or qualifying draw entry at ATP Tour tournaments. Players on the Challenger Tour are usually young players looking to advance their careers, those who fail to qualify for ATP events, or former ATP players looking to get back into the big tour.
The PDC Order of Merit is a world ranking system used by one of the darts organisations, the Professional Darts Corporation (PDC). Following the 2007 PDC World Darts Championship it superseded a world ranking system based on points being awarded for performances in ranking tournaments.
The ATP Challenger Tour is the secondary professional tennis circuit organized by the ATP. The 2009 ATP Challenger Tour calendar comprised 20 top tier Tretorn SERIE+ tournaments, and 142 regular series tournaments, with prize money ranging from $25,000 up to $150,000.
The ATP Challenger Tour is the secondary professional tennis circuit organized by the ATP. The 2010 ATP Challenger Tour calendar comprises 13 top tier Tretorn SERIE+ tournaments, and approximately 150 regular series tournaments, with prize money ranging from $35,000 up to $150,000.
The Q Tour is a series of snooker tournaments, immediately below the level of the World Snooker Main Tour.
The ATP Challenger Tour was the secondary professional tennis circuit organized by the Association of Tennis Professionals (ATP). The 2011 ATP Challenger Tour calendar comprised 15 top tier Tretorn SERIE+ tournaments, and approximately 150 regular series tournaments, with prize money ranging from $35,000 up to $150,000.
The ATP Challenger Tour Finals was a tennis tournament played between 2011 and 2015 at the end of season, involving the top seven players in that year's ATP Challenger Tour, plus an invited player from the tournament's host country.
Divij Sharan is an Indian professional tennis player. He specialises in doubles and competes on the ATP World Tour. He has won five ATP doubles titles and represents India in the Davis Cup. He won a gold medal in the men's doubles at the 2018 Asian Games.
The ATP Challenger Tour was the secondary professional tennis circuit organized by the ATP. The 2012 ATP Challenger Tour calendar comprised 15 top tier Tretorn SERIE+ tournaments, and a total of 148 tournaments, with prize money ranging from $35,000 up to $150,000.
Brooks Koepka is an American professional golfer. Early in his professional career, Koepka failed to earn entry into the PGA Tour and turned to Europe and had immediate success, winning three times on the 2013 Challenge Tour to earn a promotion to the European Tour. The following year, he won the Turkish Airlines Open earning him Rookie of the Year honors on the European Tour. In 2015, Koepka played his inaugural season on the PGA Tour, winning the Phoenix Open. In 2017, Koepka won the U.S. Open precipitating on one of the greatest winning streaks in the history of the major championships, winning four majors over the course of a two-year timespan. In 2022, Koepka joined LIV Golf where he has continued with much success, winning several tournaments.
Reilly Opelka is an American professional tennis player. At 6 feet 11 inches tall, he is tied for the tallest-ever ATP-ranked player, and can produce serves that measure over 140 mph. He has been ranked as high as world No. 17 in singles by the ATP, which he achieved on February 28, 2022, and in doubles as world No. 89 on August 2, 2021. He has won four ATP singles titles and one doubles title. He is a junior Wimbledon champion.
Zhang Zhizhen is a Chinese professional tennis player. He reached a career-high ATP singles ranking of world No. 31 in July 2024 and a doubles ranking of No. 49 in June 2024. As of July 2023, he became the highest-ever ranked Chinese male tennis player. He is the current No. 1 Chinese player. He has won three singles and two doubles titles on the ATP Challenger, and two singles and two doubles titles on the ITF Futures Tour.
The Båstad Challenger was a mens tennis tournament held in Båstad, Sweden founded in 2016. The event is part of the ATP Challenger Tour and is played on outdoor clay courts until 2018 when it was discontinued.
The Oracle Challenger Series – Houston is a professional tennis tournament played on hard courts. It is currently part of the ATP Challenger Tour and the Women's Tennis Association (WTA) 125K series. It is held annually in Houston, United States since 2018. The ATP Challenger Tour returned to Houston, Texas for the first time since 2001, with the inaugural Oracle Challenger Series Houston making its debut in November. Held on the campus of Rice University, at the new $9 million George R. Brown Tennis Complex. Houston is will become one of just two U.S. cities to host tournaments on both the ATP World Tour and ATP Challenger Tour, with the ATP World tour tournament being the U.S. Men's Clay Court Championships. The Oracle Challenger Series – Houston is the second stop for the Oracle Challenger Series calendar. The winner of the Oracle Challenger Series earns a wild card into Indian Wells Masters.
Robert Duncan MacIntyre is a Scottish professional golfer who plays on the European Tour and PGA Tour.
The ATP Challenger Tour in 2020 was the secondary professional tennis circuit organized by the ATP. The 2020 ATP Challenger Tour calendar comprised 57 tournaments with prize money ranging from $35,000 up to $162,480. It was the 43rd edition of challenger tournaments cycle and 12th under the name of Challenger Tour.
The ATP Challenger Tour in 2021 was the secondary professional tennis circuit organized by the ATP. The 2021 ATP Challenger Tour calendar comprised 147 tournaments with prize money ranging from $36,680 up to $156,240. It was the 44th edition of challenger tournaments cycle, and 13th under the name of Challenger Tour.
Johan Edfors 
