![Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne, Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,](https://c8.alamy.com/comp/2M2NWC7/elise-mertens-and-her-coach-david-taylor-pictured-during-a-training-session-ahead-of-the-secound-round-at-the-australian-open-tennis-grand-slam-wednesday-16-january-2019-in-melbourne-park-melbourne-australia-this-first-grand-slam-of-the-season-will-be-taking-place-from-14-to-27-january-belga-photo-patrick-hamilton-2M2NWC7.jpg)
Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,
![Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne, Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,](https://c8.alamy.com/comp/2M2NWC5/elise-mertens-and-her-coach-david-taylor-pictured-during-a-training-session-ahead-of-the-secound-round-at-the-australian-open-tennis-grand-slam-wednesday-16-january-2019-in-melbourne-park-melbourne-australia-this-first-grand-slam-of-the-season-will-be-taking-place-from-14-to-27-january-belga-photo-patrick-hamilton-2M2NWC5.jpg)
Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,
![Mertens' coach David Taylor pictured during a training session preparing for the 'Australian Open' tennis Grand Slam, Sunday 13 January 2019 in Melbourne Park, Melbourne, Australia. This first grand slam of the Mertens' coach David Taylor pictured during a training session preparing for the 'Australian Open' tennis Grand Slam, Sunday 13 January 2019 in Melbourne Park, Melbourne, Australia. This first grand slam of the](https://c8.alamy.com/comp/2M2NR5R/mertens-coach-david-taylor-pictured-during-a-training-session-preparing-for-the-australian-open-tennis-grand-slam-sunday-13-january-2019-in-melbourne-park-melbourne-australia-this-first-grand-slam-of-the-season-will-be-taking-place-from-14-to-27-january-belga-photo-patrick-hamilton-2M2NR5R.jpg)
Mertens' coach David Taylor pictured during a training session preparing for the 'Australian Open' tennis Grand Slam, Sunday 13 January 2019 in Melbourne Park, Melbourne, Australia. This first grand slam of the
![Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound rou Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound rou](https://cdn.imago-images.com/bild/sp/0038325469/m.jpg)
Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound rou
![Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne, Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,](https://l450v.alamy.com/450v/2m2np5f/elise-mertens-and-her-coach-david-taylor-pictured-during-a-training-session-at-the-australian-open-tennis-grand-slam-saturday-12-january-2019-in-melbourne-park-melbourne-australia-this-first-grand-slam-of-the-season-will-be-taking-place-from-14-to-27-january-belga-photo-patrick-hamilton-2m2np5f.jpg)
Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,
![Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne, Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,](https://c8.alamy.com/comp/2M2NWC8/elise-mertens-and-her-coach-david-taylor-pictured-during-a-training-session-ahead-of-the-secound-round-at-the-australian-open-tennis-grand-slam-wednesday-16-january-2019-in-melbourne-park-melbourne-australia-this-first-grand-slam-of-the-season-will-be-taking-place-from-14-to-27-january-belga-photo-patrick-hamilton-2M2NWC8.jpg)
Elise Mertens and her coach David Taylor pictured during a training session ahead of the secound round at the 'Australian Open' tennis Grand Slam, Wednesday 16 January 2019 in Melbourne Park, Melbourne,
![Naomi Osaka, of Japan, left, talks with her coach David Taylor, right, during her match against Simona Halep at the Miami Open tennis tournament, Friday, March 24, 2017, in Key Biscayne, Fla. ( Naomi Osaka, of Japan, left, talks with her coach David Taylor, right, during her match against Simona Halep at the Miami Open tennis tournament, Friday, March 24, 2017, in Key Biscayne, Fla. (](https://c8.alamy.com/comp/2MW7BRR/naomi-osaka-of-japan-left-talks-with-her-coach-david-taylor-right-during-her-match-against-simona-halep-at-the-miami-open-tennis-tournament-friday-march-24-2017-in-key-biscayne-fla-ap-photolynne-sladky-2MW7BRR.jpg)