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#2 Mike Estep
Mike Estep was the coach of the legendary Martina Navratilova. Prior to taking up coaching, he was a professional on the tour himself, winning two ATP singles titles and seven ATP doubles titles in his career.
Estep's coaching career was extremely productive as he guided players like Martina Navratilova, Hana Mandlikova, Jana Novotna and Arantxa Sanchez Vicario to Grand Slam titles.
Most notably, he was part of Navratilova's team during 10 of her 18 Grand Slam Singles triumphs.
#3 Brad Gilbert
The author of ‘Winning Ugly’, the foremost coaching manual available to coaches and novices, American Brad Gilbert is renowned for his partnership with Andre Agassi. Agassi won six of his eight Grand Slams with Gilbert by his side; he has on numerous occasions heaped rich praise on Gilbert.
After parting ways with Agassi, Gilbert became the coach of rising American tennis star Andy Roddick. He guided Andy Roddick to his only Grand Slam title, at the US Open of 2003.
Gilbert later coached Andy Murray between 2006 and 2007. It was then that the Scot became the top-ranked British player.
In recent years, Gilbert has also worked with Kei Nishikori and Sam Querrey.
