The Philippines are due to take on France and New Zealand in Group B in front of their home fans.
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Serbia also improved to 2-0 in the tournament it is hosting in Belgrade by beating Angola 83-60.
From each of the three six-nation events, one team will earn an Olympic berth to complete the 12-team draw in Rio.
Greece will play Mexico on Wednesday in its second group game.
Croatia will play the victor of Italy and Mexico on Saturday, with the victor securing a place in the Rio Olympics.
Three Olympic qualification places will be decided at the 2016 FIBA Olympic Qualifying Tournaments this week.
The Canadians held on despite scoring just 11 points in the fourth quarter.
Antetokounmpo was 7 for 8 from the field in just 19 minutes.
Senegal faces Turkey on Thursday, with the victor getting the No. 2 spot from Group A and the loser eliminated. Corey Webster, his brother, added 23 points.
Hamed Haddadi, formerly of the Phoenix Suns and Memphis Grizzlies, had 16 points and 4 rebounds for Iran. Renaldo Balkman had a tiebreaking follow shot with 1:08 left as the Puerto Ricans moved into Saturday’s championship game against Serbia or the Czech Republic.
Reggie Moore was the only Angolan in double figures with 10 points.
Lukas Palyza scored 22 points and the Czechs were in control almost throughout to clinch a semifinal spot.
Mexico boasts Charlotte Hornet Jorge Gutierrez while Czech Republic have former National Basketball Association players Jiri Welsch and Jan Vesely on their roster.
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Giannis Antetokounmpo of the Milwaukee Bucks scored 21 points for the Greeks, who trailed 35-33 at halftime before seizing control by outscoring Mexico by 14 points in the third. Coming to the tournament without Mahdi Kamrani and Samad Nikkhah Bahrami, star center Hamed Haddadi led the team with 16 points with Osian Sahakian and Arselan Kazemi combining with five points and almost 60 minutes.
