Roberta Vinci. 16th ranked woman in the world against an unseeded Elena Vesnina, currently see Vinci listed at +115 at 5dimes. She's ranked #1 in the world in doubles right now, so we already know she has top 8 overall talent she just spreads it out over single and doubles. Vesnina did just beat the 21st seed, but I think Vinci who hasn't lost a set in either single or doubles competition takes it to her and wins tonight.
Full disclosure: Had Vinci as part of a parlay the other night so I watched her match against Amanmuradova and she looked good against an overmatched player.