Medvedev marks rise to No 1 with Acapulco win, sets Nadal rematch

Daniil Medvedev celebrated his rise to the world number one ranking with a 6-2, 6-3 victory over Yoshihito Nishioka in the quarter-finals of the ATP Mexico Open on Thursday.

The 26-year-old Russian rode a rollercoaster of emotions after learning he'd take over the top spot thanks to Serbian star Novak Djokovic's quarter-final defeat in Dubai hours earlier.

But he got the job done against Japan's Nishioka and booked a semi-final showdown with Rafael Nadal in a rematch of the Australian Open final.

"It's not easy actually to play a match when you get this (news) during the day," Medvedev said of maintaining his focus after learning he will supplant Djokovic atop the rankings on Monday.

Djokovic's 6-4, 7-6 (7/4) upset at the hands of Czech world No 123 Jiri Vesely ensured the Serb's reign will end.

"To be honest, I saw that he was losing, but I didn't know that if he loses I'm going to become number one," Medvedev said. "I thought that I had to do something big here. So then when I was receiving all the messages, well, I understood, OK, it's going to happen.

"The first goal for me was to still win today, because I'm here to try to win every match I play.

"But it's definitely some great news."

Medvedev will become the first man since 2004 outside the game's "Big Four" of Djokovic, Nadal, Roger Federer and Andy Murray to occupy the number one spot.

He becomes the third Russian man after Yevgeny Kafelnikov and Marat Safin to ascend to number one.

Despite the distractions of the day, Medvedev needed just 70 minutes to dispatch Nishioka.

The Japanese qualifier went up an early break in the second set, leading 3-1 before Medvedev won the final five games of the match.

"He's a tough opponent," Medvedev said. "He knows how to return, how to