Order of play, Day 5: Williams sisters Venus and Serena do battle, Nadal also in action

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This was an easy one to pick. Despite their seedings, of course Serena - the 23-time Grand Slam winner - will be favourite. However, imagine if her continuing comeback after becoming a mother is derailed by her older sister. So many possible plot twists.

Stephens, the defending champion, was nowhere near her best in her second-round win over Anhelina Kalina. However, Azarenka looked ominous in dispatching Daria Gavrilova 6-1, 6-2.

Um, Jamie Murray and his partner Bethanie Mattek-Sands are taking on Amanda Anisimova (USA) M. Mmoh (USA) in the first round of the mixed doubles. That's the best we can offer. Although it's also worthwhile keeping an eye on Andy Murray on Instagram. Although he's out of the on-court action, he's staying involved...

Sloane Stephens (USA) [3] vs Victoria Azarenka (Blr)

Rafael Nadal (Spa) [1] vs Karen Khachanov (Rus) [27]

Serena Williams (USA) [17] vs Venus Williams (USA) [16]

Juan Martin del Potro (Arg) [3] vs Fernando Verdasco (Spa) [31]

Barbora Strycova (Cze) [23] vs Elise Mertens (Bel) [15]

Wang Qiang (Chi) vs Elina Svitolina (Ukr) [7]

Denis Shapovalov (Can) [28] vs Kevin Anderson (RSA) [5]

Milos Raonic (Can) [25] vs Stan Wawrinka (Sui)

Sofia Kenin (USA) vs Karolina Pliskova (Cze) [8]

Ekaterina Makarova (Rus) vs Anastasija Sevastova (Lat) [19]

Dominic Thiem (Aut) [9] vs Taylor Fritz (USA)

John Isner (USA) [11] vs Dusan Lajovic (Srb)

Karolina Muchova (Cze) vs Ashleigh Barty (Aus) [18]

F. Lopez (ESP) [10] & M. Lopez (ESP) [10] vs. C. Harrison (USA) & R. Harrison (USA)

N. Basilashvili (GEO) vs.G. Pella (ARG)

K. Kanepi (EST) vs. R. Peterson (SWE)

B. Coric (CRO) [20] v D. Medvedev (RUS)