1.5 units on Gulbis/Querrey over 39.5 games @ $1.75 (Betvictor)
Most likely going to 4+ sets, both these two have too much of an inconsistent streak to win in straight sets. Strong servers, high hold rates, should be at least one tiebreak.
1 unit on Roger-Vasselin/Garcia-Lopez over 38.5 games @ $1.85 (Pinnacle)
Can really see a 5 setter happening here. Went to 5 at Wimbledon '12, 10-8 in the fifth, with two 7-6 sets and a 7-5 set also. Played last year in Casablanca for two tiebreaks and a 6-2. Both played some close matches and sets this season.