Zverev, who is looking for his fourth tournament win of the year, needed only 64 minutes to defeat Nishikori and move into the final in WashingtonDC where he will play Kevin Anderson after the South African beat Jack Sock by the same score.
Former men's champion Mats Wilander believes third seed Muguruza now looks like the most likely champion, having not dropped a set and thrashing Maria Sharapova on Wednesday.
Kenin, Andreescu to be part of team event in Charleston in June
World number one Naomi Osaka will "probably" defend her US Open title, even if it means defying her doctor's orders.
Photos from matches played at the US Open in Flushing Meadows on Sunday
Playing in his first competitive singles match on the ATP Tour since August 5, the 20-times Grand Slam champion showed no signs of rust in his second round win against Lithuanian qualifier Ricardas Berankis.
Rafael Nadal will have his work cut out when play begins next week, not on the Caja Magica's three red dust courts, but on gaming consoles.
Grigor Dimitrov dispatched American 10th seed Frances Tiafoe in straight sets with a convincing 6-2 6-3 6-2 victory on Sunday.
Spain's Garbine Muguruza successfully defended her Monterrey Open title on Sunday when Victoria Azarenka retired injured from her first WTA singles final in three years.
IMAGES from Day 6 of the Australian Open in Melbourne, on Saturday.
Simona Halep's powers of recovery will be put to the test on day eight of the Australian Open on Monday when the world number one meets Japan's Naomi Osaka in a tricky fourth round clash.
The 19-year-old beat the Japanese wildcard 6-2, 6-2 to set up a showdown with former US Open champion Sam Stosur, who downed American teenager Madison Keys 6-1, 6-2 in the other semi at the $250,000 event on the hard courts in Osaka.
He leads the men's seedings ahead of defending champ Roger Federer, with Bulgarian Grigor Dimitrov seeded third.
A round-up of all tennis action on Saturday.
Images from Day 5 of the 2023 Australian Open at Melbourne Park on Friday.
Security worries could create a tense atmosphere at the French Open this year after a bomb attack on a British concert hall killed 22 people, French tennis player Lucas Pouille said.
Not many would have bet on unseeded Americans Danielle Collins and Frances Tiafoe making it to the Australian Open quarter-final
Venus Williams stands in the way of younger sister Serena's bid for a calendar-year Grand Slam after reaching the quarter-finals with a 6-2, 6-1 rout of Estonian teenager Anett Kontaveit on Sunday.
Fritz delivers as US win inaugural United Cup crown
Regaining the world's top ranking in women's tennis is less important to Maria Sharapova.
IMAGES from the US Open matches played on Day 1 at the Flushing Meadows in New York on Monday.
The Australian Open will lose one of its giant killers when South Korean Chung Hyeon meets American Tennys Sandgren in an unlikely quarter-final showdown at the Rod Laver Arena on Wednesday.
Andy Murray would not have continued playing at the Australian Open if his father-in-law's health had deteriorated following his collapse at Rod Laver Arena, the world number two said on Monday.
Images from Day 8 of the Australian Open at Melbourne Park on Monday.
Novak Djokovic and Andy Murray will face off in a second claycourt final within eight days at the Italian Open after the two in-form players proved on Saturday that they will be the ones to beat at the season's second Grand Slam in Roland Garros.
Serena Williams has defeated her compatriot in four straight matches since a defeat in the quarter-finals of the 2013 Australian Open.
Images from matches played on Day 4 at the US Open at the Flushing Meadows in New York on Thursday.
World No 1 Serena Williams has tormented Maria Sharapova for over a decade
A summary of sports stories from across the globe
Russia's Elena Vesnina ousted German second seed Angelique Kerber 6-3, 6-3 to reach the quarter-finals of the BNP Paribas Open at Indian Wells, California on Tuesday.
Serena Williams and Marin Cilic both survived third round scares on Friday to keep their US Open title defences on track but there was no escape for Rafael Nadal with the twice-winner going down in a late night thriller.
A look at the records of Czech Republic's Karolina Pliskova and Japan's Naomi Osaka before their semi-final match at the Australian Open on Thursday (prefix number denotes seeding):
Victoria Azarenka withstood some early pressure from Britain's Johanna Konta to continue her quest for a third Miami Open title with a 6-4, 6-2 quarter-final victory on Wednesday.
Murray was made to fight for two hours and 52 minute
World number ones Serena Williams, aiming to complete the first calendar-year Grand Slam in 27 years, and Novak Djokovic have been named the top seeds for the US Open championships starting on Monday in New York.
Halep's near-flawless display at the All England Club marked a spectacular return to form after her world ranking dropped from first to seventh between mid-January and July.
SSerena Williams swept past Anastasija Sevastova 6-3, 6-0 on Thursday and into the final of the US Open to sit one win away from a record-equalling 24th Grand Slam title.
Serena William powered her way to within two victories of a seventh US Open title on Tuesday and while she refused to look ahead there are many willing to do it for her, and what they see is a suddenly open path to a 24th Grand Slam.
Images from Day 8 of the Australian Open in Melbourne on Monday.
Images from Day 5 of the 2023 Wimbledon Championships on Friday.
