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 1200 players from all the 5 continents are registered with the PSA and rankings are updated monthly based on players' performances.
The 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 a worldwide top-tier tennis tour for men organized by the Association of Tennis Professionals. 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 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 ITF Women's World Tennis Tour, previously known as the ITF Women's Circuit, is a series of professional tennis tournaments run by the International Tennis Federation for female professional tennis players.
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.
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 who plays in the LIV Golf League. He formerly played on the PGA Tour. In October 2018, Koepka became world number one in the Official World Golf Ranking and remained for 47 weeks after winning the 2018 CJ Cup. He won the U.S. Open in 2017 and 2018, and the PGA Championship in 2018 and 2019, becoming the first golfer in history to hold back-to-back titles in two majors simultaneously. In 2023 Koepka won the PGA Championship for the third time, bringing his total to five majors won within six years. He started his career on the European Challenge Tour and eventually the European Tour. Koepka played college golf at Florida State University.
The ATP Challenger Tour, in 2016, was the secondary professional tennis circuit organized by the ATP. The 2016 ATP Challenger Tour calendar contained 166 tournaments, with prize money ranging from $40,000 up to $125,000. It was the 39th edition of challenger tournaments cycle, and 8th under the name of Challenger Tour.
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.
Jannik Sinner is an Italian professional tennis player. He has been ranked as high as world No. 4 by the ATP, achieved on 2 October 2023, making him the highest ranked Italian male player in history. He also has a career-high ranking of world No. 124 in doubles, achieved on 27 September 2021. Sinner has won ten ATP Tour titles in singles, including a Masters 1000 title at the 2023 Canadian Open, and one in doubles.
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 Hamburg Ladies & Gents Cup is a professional tennis tournament played on indoor hard courts. It is currently part of the ATP Challenger Tour and the ITF Women's World Tennis Tour. It is held annually in Hamburg, Germany since 2019.
The ATP Challenger Tour in 2022 was the secondary professional tennis circuit organized by the ATP. The 2022 ATP Challenger Tour calendar comprised 184 tournaments with prize money ranging from $37,520 up to $159,360. It was the 45th edition of Challenger tournaments cycle and 14th under the name of Challenger Tour.
The 2023 ATP Tour was the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2023 tennis season. The 2023 ATP Tour calendar comprised the Grand Slam tournaments, supervised by the International Tennis Federation (ITF), the ATP Finals, the ATP Tour Masters 1000, the United Cup, the ATP 500 series, the ATP 250 series. Also included in the 2023 calendar were the Davis Cup, Next Gen ATP Finals, Laver Cup, Hopman Cup, none of which distributed ranking points. 2023 marked the return of the ATP tournaments in China after strict COVID-19 protocols in the country.
The Association of Tennis Professionals (ATP) Challenger Tour in 2023 is the secondary professional tennis circuit organized by the ATP. The 2023 ATP Challenger Tour calendar comprises 196 tournaments, with prize money ranging from $40,000 up to $220,000. It is the 46th edition of Challenger tournaments cycle and 15th under the name of Challenger Tour.
Oscar Florén 
