Last year, Daria Gavrilova captured her maiden title in New Haven. This year, the Australian kicks off her defence against Irina-Camelia Begu - whom she has not beaten in two attempts. The Romanian was victorious 2-6, 6-4, 6-2 in the first round of the 2013 Nanjing 125K event and again 7-6(6), 6-1 in the first round of Wimbledon 2015.
Wildcard CoCo Vandeweghe is bidding to snap a four-match losing streak stretching back to 's-Hertogenbosch in June. The American is yet to win a set in three previous encounters with Magdalena Rybarikova - two on grass and one on clay; indeed, she has never won more than three games in any set she has played against the Slovak.
Last year's runner-up Dominika Cibulkova reprises her Roland Garros first round against Julia Goerges. The German took that match 6-4, 5-7, 6-0 to level the head-to-head at 1-1, having previously lost to Cibulkova at Wimbledon 2011.
Carla Suárez Navarro dominates her head-to-head against Barbora Strycova, leading the Czech 7-1 overall in a rivalry stretching back a decade - but today will mark their first encounter on hard courts. The pair first played in the first round of Palermo in 2008, which the Spaniard won 7-5, 7-6(2), and most recently in the first round of Madrid this year, which she took 6-3, 6-3. All of Suárez Navarro's wins have been in straight sets, including a double bagel victory in Oeiras in 2014; Strycova's sole victory was a 6-4, 7-5 win in the second round of Acapulco in 2009.
ORDER OF PLAY (all courts start 11am)
Magdalena RYBARIKOVA (SVK) vs [WC] CoCo VANDEWEGHE (USA)
Dominika CIBULKOVA (SVK) vs Julia GOERGES (GER) 
Barbora STRYCOVA (CZE)  vs Carla SUÁREZ NAVARRO (ESP)
Irina-Camelia BEGU (ROU) vs Daria GAVRILOVA (AUS) 
Qualifying - Rebecca PETERSON (SWE) vs Sofia KENIN (USA) to finish 56
Qualifying - Margarita GASPARYAN (RUS) vs Monica PUIG (PUR)
Qualifying - Rebecca PETERSON (SWE) or Sofia KENIN (USA) vs Ana BOGDAN (ROU)
Alicja ROSOLSKA (POL) / Abigail SPEARS (USA) vs Raquel ATAWO (USA) / Anna-Lena GROENEFELD (GER)
Darija JURAK (CRO) / Raluca OLARU (ROU) vs Dalila JAKUPOVIC (SLO) / Renata VORACOVA (CZE)
Qualifying - Kirsten FLIPKENS (BEL)  vs Tamara ZIDANSEK (SLO) to finish 36 24
Qualifying - Belinda BENCIC (SUI)  vs Dayana YASTREMSKA (UKR)
Qualifying - Kirsten FLIPKENS (BEL)  or Tamara ZIDANSEK (SLO) vs Zarina DIYAS (KAZ)
Qualifying - Camila GIORGI (ITA)  vs Samantha STOSUR (AUS)
Qualifying - Aliaksandra SASNOVICH (BLR)  vs Pauline PARMENTIER (FRA)