Head to heads are 3-3. Their last matches were in 2014. Errani won on clay and Makarova won on a hard court.
Errani’s hard court stats this year are a little stronger. Both players reached the 3rd round in Rio. This isn’t an easy one to call. Makarova has the better game for these courts but so often she under performs. Errani has been playing better than she was over the last few months but will always have a weak serve and she needs to make the most of her retrieving skills.
Both players will have their chances. If Makarova can serving at her best she has a great chance but Errani’s consistency can frustrate opponents. Back Makarova if she is broken first. Three sets are likely. Initial value is on Errani but I would favour Makarova to win a tight match.