The last player I worked with Mona Barthel climbed from 80 to 61 WTA .
The last player I worked with Mona Barthel went on to reach 23 her highest ranking to date and winning some big tournaments on the way .
The last player I worked with Mona Barthel climbed from 80 to 61 WTA and went on to reach 23 her highest ranking to date and winning some big tournaments on the way .