Roger Federer has already had two knee surgeries

Credit: USA Today

Roger Federer has withdrawn from the Tokyo Olympics after picking up a knee injury during the grasscourt season, the Swiss said on Tuesday.

Federer, who turns 40 next month, had two knee surgeries in 2020 which resulted in more than a year of rehabilitation.

He withdrew from the French Open after winning his third round match to save himself for the grasscourt season. He was beaten in the quarter-final at Wimbledon.

"During the grass court season, I unfortunately experienced a setback with my knee, and have accepted that I must withdraw from the Tokyo Olympic Games," Federer said on Twitter.

"I am greatly disappointed, as it has been an honour and highlight of my career each time I have represented Switzerland.

"I have already begun rehabilitation in the hopes of returning to the tour later this summer. I wish the entire Swiss team the best of luck and I will be rooting hard from afar."

Federer won the gold medal in the doubles at the 2008 Games in Beijing and a silver medal in the singles four years later in London.

Betting patterns prompt Wimbledon investigation

By Ben Rumsby

Two matches at Wimbledon are under investigation for possible corruption after triggering betting alerts.

The International Tennis Integrity Agency (ITIA) confirmed it was looking into what were first-round singles and doubles matches following intelligence provided by several bookmakers.

The former match saw a five-digit sum successfully wagered on the result at the end of the second set, as well as winning bets placed on the number of service games in the match.

The latter matter match was flagged over the timing of bets placed on one of the pairs to lose.

The last known matches at Wimbledon to have triggered betting alerts were in 2017 when three were recorded.

One of the matches was from the main draw and the other two took place during the qualifying tournament.

The alerts were assessed and reviewed by the Tennis Integrity Unit – which was this year succeeded by the ITIA.

In 2016, the All England Club announced it would be reinforcing its defences against the high-profile integrity issues threatening tennis – match-fixing and doping.

Betting alerts are raised in response to unusual betting patterns, which are not in and of themselves evidence of match-fixing. A number of other factors, such as playing conditions or an injury to one of the players, could account for anomalous betting patterns.

The ITIA receives information about suspicions of match-fixing from betting companies and regulators and is obliged to investigate should a red flag be raised.

The matches at grand slam level that prompted alerts are the biggest cause for concern but it is in the lower levels of the game where unusual betting patterns are most rife.

In its latest quarterly report, the ITIA said it received a total of 11 match alerts between April and June through its confidential Memoranda of Understanding with the regulated betting industry.