MIAMI (AFP) — Defending champion Jessica Pegula clinched back-to-back victories at the WTA Charleston Open clay court tournament on Sunday, routing Ukraine's Yuliia Starodubtseva in straight sets to claim her second title of the year.

Top seed Pegula, who had gone to three sets in every round on her way to Sunday's final, was in no mood to take the scenic route again as she sprinted to a 6-2, 6-2 victory in one hour and 22 minutes against her 89th-ranked opponent.

The Charleston victory follows Pegula's win at the Dubai Open in February and is the 11th title of the 32-year-old New Yorker's career.

After an even start, Pegula seized control in the fifth game of the first set, grabbing the first break point of the match when Starodubtseva pulled a forehand wide.

The Ukrainian saved that point but was quickly in trouble again, giving Pegula another break point with a rushed return which the American converted for a 3-2 lead.

After holding to go 4-2 up, Pegula then went a double-break ahead as more unforced errors from Starodubtseva proved costly.

After comfortably serving out for the set, Pegula was soon on the offensive in the second, breaking Starodubtseva for a third time to 1-0 up.

Starodubtseva finally began to exert some pressure in the next game and twice carved out break points.

But Pegula slammed the door shut to hold for 2-0 and then rammed home the advantage by breaking again for a 3-0 lead.

Another break left her 5-0 up and serving for the match. Starodubtseva finally showed some resilience to fight off three match points to grab her first break to make it 5-1.

But Pegula made no mistake on her next service game, holding to love to wrap up victory.

Meanwhile, American fourth seed Tommy Paul saved three match points before scoring a battling three-set victory over unseeded Argentine Roman Burruchaga to win the ATP Houston US Men's Clay Court Championship.

Paul, 28, held his nerve in a nail-biting third set to dig out a 6-1, 3-6, 7-5 triumph in two hours and 40 minutes to claim the fifth ATP title of his career.

The American had looked to be heading for defeat after the 77th-ranked Burruchaga engineered a trio of match points while leading 5-3 on Paul's serve in the decisive third set.

But Paul showed tremendous resilience to put out that fire and hold, and then broke Burruchaga in the next game to square the match at 5-5.

Buoyed by that narrow escape, Paul then held to love to go 6-5 up, and suddenly the pressure was all on the 24-year-old from Buenos Aires, playing in his first ATP final.

Burruchaga, the son of 1986 World Cup-winning footballer Jorge Burruchaga, appeared equal to the challenge after going 40-0 up.

Yet once again, Paul dug deep and clawed his way back to deuce.

The American moved to match point when Burruchaga drilled a backhand wide down the line, and then clinched victory when the South American yanked a wild forehand long on the next point.