BOGOTÁ, Colombia - Brazilian qualifier Beatriz Haddad Maia won the last five games of the second set to see off Laura Siegemund and reach the second round of the Claro Open Cosalnitas on Monday, 6-2, 7-5.
The left-hander trailed 5-2 after easing through the opener against the former World No.27, but steadied in the crucial moments to deny the German an opportunity to level the match.
The German struggled with consistency for the duration of the one hour, 32-minute clash, with Haddad Maia already playing her third match of the week in the Colombian altitude after coming through qualifying.
Siegemund served eight double faults, and though she saved 10 of the 14 break points she faced for the match, was also done in by 36 unforced errors overall.
After seeing off a clay court maven in Siegemund, Haddad Maia will next have the opportunity to match wits with defending champion Anna Karolina Schmiedlova, who was also a winner in Monday's day session.
The No.4 seed defeated Belgian's Ysaline Bonaventure, 6-2, 6-4, to open her title defense, and was joined as an early winner by Varvara Lepchenko, Italian qualifier Jasmine Paolini and wildcard Maria Camila Osorio Serrano.
The locals had something to cheer about with the 17-year-old Osorio Serrano earning her first WTA main draw win against Switzerland's Conny Perrin, 6-4, 6-4.
Lepchenko downed Bulgaria's Elitsa Kostova, 6-3, 6-1, while Paolini rallied from a third-set deficit to defeat another American in Francesca Di Lorenzo, 6-3, 3-6, 6-4.