Gauff routs Ostapenko to reach US Open semi-finals
Gauff, whose lead-up to the US Open included hardcourt titles in Washington and Cincinnati, converted six of her seven break points and dropped serve just once during the 67-minute match in Arthur Ashe Stadium.
Ostapenko entered the match full of confidence having upset world number one Iga Swiatek in the previous round but against Gauff the misfiring Latvian 20th seed could not find her range and delivered an error-filled performance.
Gauff was in control from the start and showcased excellent court coverage while delivering a steady stream of balls deep into the corners en route to capturing the first set in 20 minutes and limiting Ostapenko to seven points.
Former French Open champion Ostapenko, playing in her first US Open quarter-final, finally got on the board with a break to level the second set at 1-1 but Gauff never wavered as she broke right back and cruised home.
The American went up a double break for a 5-2 lead before closing out the match on her serve in a game in which she had to come back after falling behind 0-30.
With the win, Gauff avenged her round of 16 loss to the Latvian at this year's Australian Open that left the American in tears.
Up next for Gauff, who is the youngest American to reach the US Open semi-finals since Serena Williams in 2001, will be either Czech 10th seed and French Open finalist Karolina Muchova or Romanian 30th seed Sorana Cirstea.
