The British player admitted to testing positive for the banned stimulant cocaine in a drugs test in April.

Evans, the British number three, provided a positive sample at the Barcelona Open on April 24.

He is currently serving a provisional suspension from competition, with the prospect of a ban from the sport looming.

The report has revealed a total of 1,163 in competition urine samples were collected in the opening two quarters of the year, with a further 94 blood and 201 athlete biological passport samples having also been taken.

There were also 247 out-of-competition urine samples gathered, along with 257 blood and 258 athlete biological passport samples.

In total 2,223 samples were collected in the first half of the year.

The annual total of 4,899 from 2016 is set to increase this year, with the International Tennis Federation (ITF) stating that there would be an increase of over 3,000 tests this year in April.

The increase was part of an enhancement to the Tennis Anti-Doping Programme, which is a joint initiative between the ITF, the Women's Tennis Association (WTA), the Association of Tennis Professionals (ATP) and Grand Slam Board.

As part of the measures, the number of players included in the International Registered Testing Pool was increased to around 250 players.

All players in the pool are now subject to testing under the athlete biological passport programme.

The quarterly report also acknowledged the findings in seven cases arising in 2016, including Russian star Maria Sharapova’s 15-month suspension due to meldonium.

American athlete Varvara Lepchenko and Belarus’ Sergei Betov avoided bans for the same substance, while Kazakhstan’s Arsan Arashov was given a two-year sanction.

The ITF state that Arashov’s case is still subject to an appeal.

Brazil’s Yuri Schwanke was given a sanction of three years and nine months due to a positive test for metandienone and clenbuterol, while his compatriot Marcelo Demoliner received a three-month ban due to testing positive for hydrochlorothiazide.

The report also highlight that the Tennis Anti-Doping Foundation app was released in January, with athletes able to download via iOS and Android devices.

The app has information surrounding the rules of the programme, including the World Anti-Doping Agency prohibited list and guidance on how to obtain a therapeutic use exemption.

A reminder of the warning issued by the programme to players to continue to exercise extreme caution with regards to eating meat when travelling to competitions in China and Mexico, where meat contaminated with the prohibited substance clenbuterol remains a significant risk, was also mentioned.

Players were advised to eat only in restaurants and cafeterias that have been approved by the event organiser, as well as trying to eat with other players and eat either chicken or fish.

The full report can view accessed here Tennis Anti-Doping Programme Quarterly Report.msg