The Canadian's win sets up a semi-final clash with Del Potro on Saturday that will pit power against power.
Top seed Roger Federer battled past Russian Nikolay Davydenko in an entertaining 4-6, 6-3, 6-4 triumph on Saturday to reach the World Indoor Tournament final.
IMAGES from the French Open semi-finals played at Roland Garros on Friday
A summary of Thursday's play at the French Open.
World No 4 Del Potro is still sidelined with a right knee injury sustained in Shanghai last month.
US Open champion Juan Martin Del Potro will be unable to defend his title this month, having failed to recover from a wrist injury which has kept him out since January.
US Open champion Juan Martin Del Potro will stand in for Roger Federer at the invitational Kooyong Classic in January if the Swiss world number one decides against defending his title, organisers said on Tuesday.
US Open champion Juan Martin del Potro posed for photographers atop the Empire State Building in New York on Tuesday morning.
Argentine Juan Martin del Potro recovered from a horrible first-game fall to overpower David Ferrer 6-2, 6-4, 7-6(5) and reach the Wimbledon semi-finals for the first time on Wednesday. He will face 2011 champion and top seed Novak Djokovic.
Juan Martin del Potro delivered a huge blow to Britain's hopes of retaining the Davis Cup when he beat Andy Murray 6-4, 5-7, 6-7(5), 6-3, 6-4 in a five-hour thriller as Argentina grabbed a 2-0 lead in their world group semi-final on Friday.
Former U.S. Open champion Juan Martin del Potro stepped up his comeback from another wrist surgery by toppling top seed Fabio Fognini at the Sydney International on Wednesday.
Former US Open champion Del Potro fired down 11 aces and did not face a break point during the one hour, 33 minutes match.
World number one Serena Williams opened her US Open account with a tidy 6-3, 6-3 win over Ekaterina Makarova on Tuesday, to join her sister Venus in the second round of the year's final Grand Slam.
The Spaniard found himself outpaced 6-2, 6-4 after a breathtaking semi-final display of power and touch by the 2009 US Open champion at the Shanghai Masters.
World number one Roger Federer will face his US Open conqueror Juan Martin del Potro in the round-robin stage of the ATP Tour finals after getting the rough end of Wednesday's draw for the season finale. The Swiss, who is not guaranteed to end the year on top of the rankings, will also face Britain's Andy Murray and Spain's Fernando Verdasco in Group A at the eye-catching O2 Centre alongside the River Thames when play starts on Sunday.
Roger Federer conjured a brilliant winner from between his legs to bring up match point as he beat Novak Djokovic 7-6, 7-5, 7-5 in Sunday's semi-final to move within one win of a sixth successive US Open crown. The Swiss magician will face 20-year-old Juan Martin del Potro of Argentina, the sixth seed, who reached his first Grand Slam final by routing Spain's Rafael Nadal 6-2, 6-2, 6-2.
Novak Djokovic barely got out of first gear but had more than enough in the tank to beat Briton Kyle Edmund 6-3, 6-3 in the second round of the Miami Open on Friday.
For a set not even the granite defence of Novak Djokovic could withstand the irresistible brute force of Juan Martin del Potro on Sunday but the Serb then rode out the storm to win the opening semi-final at the ATP World Tour Finals.
Argentina took a big step towards reaching the Davis Cup final when David Nalbandian and Juan Martin Del Potro secured a 2-0 lead over holders Serbia on Friday.
Former US Open champion Juan Martin Del Potro underlined his status as a dark horse for next week's Australian Open by hammering Dmitry Tursunov to reach the final of the Sydney International on Friday.
Argentine sixth seed Juan Martin del Potro beat Rafael Nadal 6-2, 6-2, 6-2 on Sunday to reach his first Grand Slam final.
World No 1 Novak Djokovic will face Argentina's Juan Martin del Potro, the player who denied him a medal in London, in the opening round of the Rio Olympics after the draw was made on Thursday.
Argentina's Juan Martin del Potro put himself back in contention at the ATP World Tour Finals on Tuesday, beating Spain's Fernando Verdasco 6-4 3-6 7-6 in front of another near sell-out crowd at London's O2 Arena.
Rafael Nadal has pulled out of the Indian Wells and Miami Open tournaments after aggravating the leg injury that forced him out of the Australian Open in January, the Spanish world number two said on Friday.
The parade of serial grand slam champions is reserved for Tuesday at the ATP World Tour Finals but the supporting cast provided compelling opening acts with Stanislas Wawrinka and Juan Martin del Potro in the spotlight.
Garbine Muguruza's preparations for next week's Australian Open were thrown into disarray when the world number three pulled out of the Sydney International with a thigh injury on Wednesday.
Novak Djokovic won 12 of the last 14 games of his match against Lorenzo Musetti to crush the Italian 6-2, 6-2 and move into the quarter-finals of the Miami Open in his best performance since the Australian Open.
Indian Wells runner-up Juan Martin del Potro believes Britain's Andy Murray can become world tennis No 1 this year.
Fifth seed Juan Martin Del Potro, whose match was shunted back to the late evening by the disruptions, was the first major casualty of the men's draw when he lostto 62nd ranked Spaniard Roberto Bautista at the Australian Open.
World number five Juan Martin del Potro began his 2014 season with a win, albeit a scrappy one over Frenchman Nicolas Mahut to advance to the quarter-finals of the Sydney International on Wednesday.
World No 1 Serena Williams kept her Wimbledon title defence on track on Sunday, downing Germany's Annika Beck 6-3, 6-0 with a crushing display of power and booming serves.
The Argentine, making his first appearance at Wimbledon since reaching the semi-finals in 2013, held aloft his arms in triumph after condemning twice Grand Slam champion Stan Wawrinka to his earliest defeat at the All England Club for three years.
'Competing for Britain has been by far the most memorable weeks of my career and I'm extremely proud to get to do it one final time'
Novak Djokovic trounced fellow Serb Viktor Troicki 6-1, 6-4 in the Dubai Championships first round on Tuesday as the world number one extended his unbeaten run to 14 matches.
Novak Djokovic heads into his US Open final clash with Juan Martin del Potro on Sunday knowing he faces a challenge - a very big challenge indeed.
Juan Martin del Potro survived a tight tussle to squeeze past Swede Robin Soderling 6-7, 6-3, 7-6. He will Nikolay Davydenko, who ended seven years of pain against Roger Federer on Saturday, beating the world number one 6-2, 4-6, 7-5 to reach the final of the ATP World Tour Finals for a second successive year.
Top seed Carlos Alcaraz dominated Gael Monfils 6-2 6-4 and fourth seed Alexander Zverev escaped a tight first set en route to a 7-6(4) 6-3 win over Christopher Eubanks to reach the last 16 at the Miami Open on Monday.
The big names who will be bidding for a podium finish before bidding farewell...
With the Australian Open currently on, defending champion Novak Djokovic has once again been dubbed as a favourite to retain the title, and former world No. 17 Bernard Tomic of Australia firmly believes there will be no one to challenge the great Serbian.
How former champion Juan Martin del Potro won the crowd at US Open is amazing.