Top - ranked Serena Williams came back from 5 - 3 down in the opening set .
Top - ranked Serena Williams saved a set point in the tiebreak to beat American qualifier Christina McHale 7 - 6 ( 7 ) , 6 - 1 .
Top - ranked Serena Williams came back from 5 - 3 down in the opening set and saved a set point in the tiebreak to beat American qualifier Christina McHale 7 - 6 ( 7 ) , 6 - 1 .