Knicks rookie RJ Barrett finished summer league in July with a flourish following a horrendous start and hopes he will carry that improvement over.

However, it won’t be with Team Canada at the World Cup in China. Though his father, Rowan, is the general manager of Team Canada, Barrett elected to show up for the Aug. 4 start of training camp and participated in a few days of drills before leaving the workouts in Toronto. With Canada flying to Australia for exhibitions, Barrett stayed behind, citing a slightly strained calf.

That decision gave Barrett the opportunity to attend the NBA’s annual rookie orientation/photo shoot in Teaneck, N.J., along with fellow Knicks rookie Ignas Brazdeikis, the team’s second-round pick. Brazdeikis, a Canadian citizen who was born in Lithuania, was not invited to Team Canada’s camp.

In his Las Vegas Summer League finale in mid-July, Barrett posted 21 points, 10 assists and eight rebounds and had double-doubles in each of his previous two games. Still he finished with a shooting percentage of .338 in the five games and shot just 24 percent from beyond the 3-point arc. But the No. 3-overall pick said he has been working on other shortcomings that showed up in Vegas.

“I missed way too many layups [in summer league],” Barrett told reporters in Teaneck.