Nakashima wins Next Gen ATP Finals title

American Brandon Nakashima has kept his record perfect as he won the Next Gen ATP Finals with a second straight-set victory over Jiri Lehecka.

Nakashima took just 80 minutes to win 4-3 (7-5) 4-3 (8-6) 4-2 in Milan on Saturday night, securing the title on the first of three championship points when Czech Republic's Lehecka sent a forehand long.

The fourth-seeded Nakashima won all five of his matches at the year-ending tournament for 21-and-under players, including a straight-set victory over Lehecka in the group stage.

It was Nakashima's second appearance at the Next Gen Finals, having lost to compatriot Sebastian Korda in the semi-finals last year.

Nakashima won his first ATP title in his home city of San Diego in September.

Lehecka broke Nakashima's serve in the very first game. But Nakashima broke back in the sixth game to take the set to a tiebreaker, where the American raced into a 5-0 lead and went on to take the set.

Lehecka threatened to start the second set in similar fashion but Nakashima managed to save two break points early on.

Indeed the next break of serve was to prove the most important as it came in the final game of the tournament.

This was the fifth edition of the Next Gen ATP Finals, which has featured shorter sets of first-to-four games and other experimental format changes.

New rules included no changeovers after the first game of each set and only one sit-down per set after three games; a 15-second serve clock after aces, double-faults and unreturned serves; and coaching during an opponent's medical timeout or toilet break.