Belgian Elise Mertens won against American qualifier Asia Muhammad 6-3, 6-2 to reach the second round of the Guadalajara Open at the Centro Panamericano de Tenis on Monday.
Mertens, ranked No 34, will play the winner of the match between Russian Anna Kalinskaya and Czech Barbora Krejcikova, the No 9 seed, next.
Guadalajara WTA 1000, other first-round results (Centro Panamericano de Tenis, hard, USD 2.527.250, most recent results first):
- Marta Kostyuk beat Aliaksandra Sasnovich: 6-1, 6-3
- Bianca Andreescu beat Jil Teichmann: 6-2, 6-4
- Rebecca Marino (Q) beat Ann Li: 6-2, 7-6 (2)
- Liudmila Samsonova beat Kaia Kanepi: 6-1, 7-5
- Lin Zhu beat Alize Cornet: 3-6, 6-3, 6-4
- Victoria Azarenka (LL) beat Elina Avanesyan (LL): 6-4, 6-2
- Ajla Tomljanovic vs. Fernanda Contreras Gomez : later in Guadalajara
- Marie Bouzkova vs. Tereza Martincova : later in Guadalajara
- Anna Kalinskaya vs. Barbora Krejcikova : later in Guadalajara
- Magdalena Frech vs. Yulia Putintseva : later in Guadalajara
- Danielle Collins vs. Caroline Dolehide : later in Guadalajara
- Lauren Davis vs. Jelena Ostapenko : later in Guadalajara
- Eugenie Bouchard vs. Kayla Day : later in Guadalajara
- Donna Vekic vs. Laura Pigossi : later in Guadalajara
- Belinda Bencic vs. Leylah Fernandez : later in Guadalajara
- Elena Rybakina vs. Karolina Pliskova : later in Guadalajara
- Elisabetta Cocciaretto vs. Anastasia Potapova : later in Guadalajara
- Shelby Rogers vs. Martina Trevisan : later in Guadalajara
- Beatriz Haddad Maia vs. Katerina Siniakova : later in Guadalajara
- Magda Linette vs. Madison Keys : later in Guadalajara
- Sloane Stephens vs. Linda Fruhvirtova : later in Guadalajara
- Ekaterina Alexandrova vs. Camila Osorio : later in Guadalajara
- Bernarda Pera vs. Petra Kvitova : later in Guadalajara