With Serbian Novak Djokovic is unbeaten this year - now having won 18 matches in a row this season. The Serb's latest win came over Greek tennis player Stefanos Tsitsipas in the final of the ATP Dubai Duty Free Tennis Championships on Saturday.
This prompted a Twitter user to ask former World No. 1 Andy Roddick the secret to having a positive head to head record against Djokovic.
Roddick's answer was prompt and simple - "Retire before you have to play him again."
For the record, Roddick has a 5-4 record against Djokovic, winning the last encounter the two played at the London Olympics. The pair split their 8 hard court meetings 4-4 and Roddick led 1-0 on grass. The 37 year old Roddick is a former World No.
1 and won he 2003 US Open title. He also reached four other Grand Slam finals (Wimbledon in 2004, 2005, and 2009, and the US Open in 2006). Roddick was ranked in the year-end top 10 for nine consecutive years (2002–2010) and won five Masters Series titles in that period.
Some of the other players who have a better record against Djokovic are as below - Ivo Karlovic 2-1
Fernando González 2-1
Filippo Volandri 1-0
Jiří Veselý 1-0
Taro Daniel 1-0
Filip Krajinović 1-0
Antony Dupuis 1-0
Dennis van Scheppingen 1-0
Nick Kyrgios 2-0
Marat Safin 2-0 Of these, Krajinovic, Kyrgios, Karlovic, Vesely and Daniel are the players who are still active and Djokovic still has a chance to improve his head-to-head record against them.