Kiefer retires from professional tennis at the last couple of years . Former world number 722 wants to spend more time with his partner and baby daughter . Australian is currently ranked 722 after suffering wrist problems over the last couple of years . Kiefer reached semifinals of Australian Open and won an the ATP Tour silver medal in doubles .
Nicolas Kiefer retires from professional tennis at the age of 33 . Former world number four wants to spend more time with his partner and baby daughter . German is currently ranked 722 after suffering wrist problems over the last couple of years . Kiefer reached semifinals of Australian Open and won an Olympic silver medal in doubles .