Original sentence: During his professional career, Borg won 41% of the Grand Slam singles tournaments he entered (11 of 27) and 89.81% (141–16) of the Grand Slam singles matches he played
Edited sentence: During his relatively brief pro career, Borg won 41% of the Grand Slam singles tournaments he entered (11 of 27) and 89.81% (141–16) of the Grand Slam singles matches he played