- Top seed Sloane Stephens defeated Pauline Parmentier in straight sets 6-2 6-2
- The American, who won Mexico Open in 2016, needed just over an hour to win
- Former world No 1 Victoria Azarenka knocked out second seed Danielle Collins
- Britain’s Johanna Konta proved too strong for Laura Siegemund in Acapulco
Top seed Sloane Stephens made a winning start as she cruised past Pauline Parmentier in straight sets in the first round of the Mexico Open.
The 2016 champion dropped just four games to record a 6-2 6-2 victory in an hour and nine minutes.
The pair traded breaks at the start of the match, but Stephens found her rhythm and reeled off seven games in a row between the first and second set.
Joining her in the second round in Acapulco is former world No 1 Victoria Azarenka, who felled second seed Danielle Collins.
Currently ranked 50th in the world, Azarenka dominated her American opponent from the off, breaking twice in a row to take a 4-0 lead.
Collins had three chances to get ahead in the opening game of the second set, but the Belarusian kept her cool before going on to seal a 6-1 6-2 win.
Britain’s Johanna Konta had no trouble getting past doubles partner Laura Siegemund, taking a 6-3 6-2 victory to set up a meeting with Russia’s Varvara Flink
Flink was just 30 minutes into her match against Amanda Anisimova when the American retired at 4-3 up in the first set.
Rebecca Peterson also retired at 4-3 down against Sofia Kenin, handing the American a second-round meeting with Britain’s Katie Boulter.
Meanwhile, Canada’s Bianca Andreescu prevailed 6-1 6-3 over Jil Teichmann, No 4 seed Mihaela Buzarnescu dismissed Australia’s Daria Gavrilova 6-4 6-2 and Saisai Zheng battled from a set down to beat Renata Zarazua 3-6 7-5 6-4.
There were also wins for Tatjana Maria, 6-2 7-6 (1) over Martina Trevisan, Timea Babos, who overcame Dalila Jakupovic 5-7 6-4 6-4 and Christina McHale, who saw off Ysaline Bonaventure 6-3 1-6 6-2.