Pick: Halep in 2 sets
The pesky Italian has made it a habit of reaching the final 4 of Paris, and this year is no exception. The pair has won a match each in two meetings, but Sara won the latest one. I believe Petkovic's game isn't enough to hit through Errani, and would take an inspired performance from the German to upset her. Barring any injuries, Sara will reach the semifinals third time in a row.
Pick: Errani in 2 sets