The International Tennis Federation (ITF) has released the latest quarterly report of its Tennis Anti-Doping Programme.
The update contains information relating to the third quarter of the year, which ran from July to September.
The report has revealed a total of 1,286 in competition urine samples were collected in the third quarter of the year, with a further 250 blood and 84 athlete biological passport samples having also been taken.
There were also 303 out-of-competition urine samples gathered, along with 298 blood and 297 athlete biological passport samples.
In total 2,518 samples were collected in the quarter three, which brings the annual total to 4,741.
The report also acknowledged the findings in six cases arising since the publication of the previous update.
Britain's Dan Evans was given a one-year ban after testing positive for cocaine.
Evans, a member of the British team which won the Davis Cup in 2015, revealed he had failed for the recreational substance in June.
His ban has been backdated until the day of the positive test, meaning he will be able to return to competition on April 24 next year.
Evans' compatriot, Jamie Burdekin, was also banned after he refused to give a sample in March.
He has been handed a ban of four years as a result while Bulgaria's Dimitar Kutrovsky was handed a two-year suspension, backdated to November 2015, for testing positive for metamfetamine.
Italy's Sara Errani was also found to have committed a violation in February.
Her sample contained letrozole, a prohibited aromatase inhibitor, and she was given a two month ban which began on August 3.
Errani chose to appeal her case at the Court of Arbitration for Sport, which is still ongoing.
Two other players, Dylan Scott of the United States and The Netherlands' Jake Mak, were provisionally suspended.
Mak refused to give a sample while Scott tested positive for Dehydrochlormethyltestosterone metabolite, a prohibited anabolic agent.
Also this quarter, the ITF launched an integrity education programme for junior players.
Titled ‘ITF Knowledge’, the programme includes modules on both anti-doping and anti-corruption.
The Tennis Anti-Doping Programme applies to all players competing at Grand Slam tournaments and events sanctioned by the ITF, Association of Tennis Professionals and Women's Tennis Association.