Serena v Li Australian semi – stats that matter

Question

Williams served 12 aces to Li’s one, hit 33 winners to Li’s 21 and made 14 less unforced errors than her opponent but was still pushed to two tiebreak sets. Moving through to the final, perhaps the length of the match will be an important factor – it lasted two hours and two minutes, which for women’s tennis is a while to spend on the court.