Defending champion Alcaraz into Tokyo semi-finals after Shapovalov retirement

[p][a href="https://www.flashscore.ca/game/tennis/alcaraz-garfia-c-UkhgIFEq/shapovalov-d-zXddgn9o/?mid=2gXEXG5c"]His Canadian opponent was forced to withdraw[/a] after suffering an injury to his upper right thigh in the first game of the second set.[/p][p]Defending champion [a href="https://www.flashscore.ca/player/alcaraz-garfia-carlos/UkhgIFEq/"]Alcaraz[/a] will play fellow Spaniard [a href="https://www.flashscore.ca/player/munar-jaume/zZieQm4D/"]Jaume Munar[/a] for a place in the final after the world number 64 ended the impressive run of 86th-ranked [a href="https://www.flashscore.ca/player/jacquet-kyrian/KGKot0sk/"]Kyrian Jacquet[/a] of France.[/p][embed guid="606e3540-7ec2-4fbb-8d65-affad50418cd" url="https://www.youtube.com/watch?v=ztHmP20j0VQ" social-type="youtube" /][p]The match was hard-fought until [a href="https://www.flashscore.ca/player/shapovalov-denis/zXddgn9o/"]Shapovalov[/a]'s retirement, with Alcaraz troubled by the variety of his game as the world number 46 mixed deep shots with drop shots, and power with spin.[/p][p]Alcaraz, who saved four set points against [a href="https://www.flashscore.ca/player/arnaldi-matteo/hlVLAfZK/"]Matteo Arnaldi[/a] on Saturday, salvaged another here at 5-4 down and went on to seal the tie-break with a passing shot before Shapovalov's injury.[/p][p]The Australian Open champion is playing only his third event since returning from a months-long wrist injury, having reached the quarter-finals of the US Open last month.[/p]