Rafael Nadal stays perfect at this year’s ATP World Tour Finals.

The 29-year-old Spanish tennis star remains unbeaten in his round robin campaign, after extending his perfect mark to 3-0 on Friday.

David Ferrer turned in a valiant effort after rallying from two breaks down in the first set, but Nadal responded in kind, wrapping up the thrilling victory 6-7(2), 6-3, 6-4.

Following a rocky start to 2015, Nadale, the world No. 5, is gaining great momentum at the season finale in London.

A 17-4 post-US Open mark has included five Top 10 wins and now three straight this week at The O2.

He enters an Open Era record 46th clash against Novak Djokovic in Saturday’s semifinals after surviving a gritty two-hour and 37-minute battle against Ferrer.

Tested often, he refused to back down, even with a semifinal berth already assured.

Nadal, who notched his 60th win of the season on Wednesday, secured the immediate advantage, breaking Ferrer to 15 in the first game of the match.

Stepping inside the baseline, a rifled backhand winner down-the-line and Ferrer forehand error put him ahead 1-0. Nadal claimed 10 of the first 11 points as he raced to a 3-0 lead behind a second break. But Ferrer would go on a run of his own, taking 12 of 14 points to snatch both breaks back and draw level at 3-3. They would again exchange breaks in the 11th and 12th games, as Ferrer broke Nadal serving for the set at 6-5 – saving a set point – following a seven-minute game. In the tie-break, a wayward lob and double fault from Nadal would give Ferrer a pair of early mini-breaks and he would emerge with the opener after exactly one hour.

Nadal had confirmed his place opposite Djokovic – runner-up in the second group – in Saturday’s semi-finals after defeating Andy Murray and Stan Wawrinka earlier in the week.

He qualified for the last four at the season finale for a fifth time in seven appearances.