Canada’s Felix Auger-Aliassime is heading to the second round of the U.S. Open after surviving a stiff test in his opener on Tuesday.
The 20-year-old Auger-Aliassime made 62 unforced errors, 23 more than his opponent, but the Canadian had the big edge in winners (58-33). Both players struggled to generate any momentum without serve in a match that was just nine minutes short of hitting the four-hour mark.
Monteiro never broke Auger-Aliassime and had just two break-point opportunities — both in the fourth set.
As the score suggested, it was an extremely close match. Both players won 147 points.
Auger-Aliassime will face three-time Grand Slam winner Andy Murray of Great Britain in the second round. Murray rallied from two sets down to win a five-setter against Yoshihito Nishioka of Japan on Tuesday.
WATCH | Denis Shapovalov wins Monday opener:
No. 25 seed Milos Raonic of Thornhill squared off with Leonardo Mayer of Argentina, and Vancouver’s Vasek Pospisil battled Philipp Kohlschreiber of Germany in first-round matches later Tuesday.
Leylah Annie Fernandez of Laval, Que., the lone Canadian woman in the singles draw, met Vera Zvonareva in a first-round match later Tuesday.
Shapovalov, the No. 12 seed from Richmond Hill, Ont., won his first-round match on Monday and will face world No. 73 Kwon Soonwoo of South Korea on Wednesday.
No fans are at the tournament this year because of COVID-19.