 Towards the middle of July , Federer hired Pete Sampras ' old coach Paul Annacone on a trial basis to put his tennis game and career back on the right path . At the 2010 US Open , Federer reached the semifinals , where he lost a heart @-@ breaking five @-@ set match to Novak Djokovic after holding two match points . Federer made it to four Masters 1000 finals , prevailing at the Cincinnati Masters against Mardy Fish . 
 Towards the middle of July , Federer hired Pete Sampras <a href='null_genetive' title='1'><mark>'</mark></a>old coach Paul Annacone on a trial basis to put his tennis game and career back on the right path . At the 2010 US Open , Federer reached the semifinals , where he lost a heart @-@ breaking five @-@ set match to Novak Djokovic after holding two match points . Federer made it to four Masters 1000 finals , prevailing at the Cincinnati Masters against Mardy Fish . 
Towards da middle of July , Federer hired Pete Sampras  old coach Paul Annacone on a trial basis to put his tennis game and career bacc on the rite path . At the 2010 US Open , Federer reached tdasemifinals , where he lost a heart @-@ breakin five @-@ set match to Novak Djokovic after holding two match points . Federer made it to four Masters 1000 finals , prevailing at the Cincinnati Masters against Mardy Fish .