Cooper Flagg had the best game of his rookie season against the Toronto Raptors on Sunday. He finished the game with 22 points, four rebounds, four assists and a block.The No. 1 pick started the game 2-2 in the first quarter, totaling five points. Not much changed in the second quarter for the rookie. Flagg added seven points in the next nine minutes on 4-4 shooting.Flagg's first miss was a 3-pointer, and he ended the first half with 12 points on 4 of 5.Flagg opened the third quarter with energy, rebounding and making important plays, one of which was a lob pass to Anthony Davis. Flagg scored his first basket of the quarter with fine minutes remaining, converting a one-on-one contested layup.Cooper Flagg missed his next shot, but made another highlight cutting bounce pass to Max Christie. He had fans on their feet with a thunderous dunk in his next play. Then came the highlight of the game. Running the floor, the rookie put Sandro Mamukelashvili on a poster.Flagg scored three points in the fourth quarter before Jason Kidd decided to take him out.Cooper Flagg through four quarters against RaptorsCooper Flagg scored his first point with a dunk on an assist from PJ Washington. With just over six minutes left in the quarter, he converted a layup, ending the quarter with four points.His second quarter started on a similar note. He made a dunk and followed it up with a 3-pointer, going 4-4 from the field. Flagg added two free throws. He missed his first shot of the game in the last minutes of the second quarter. Flagg's all-around game was on full display in the third quarter. After missing his first shot, Flagg spent the next few minutes rebounding and playmaking. He scored with a driving layup and followed it up with back-to-back dunks. By the end of the third quarter, Flagg led his team in scoring with 19 points.The Mavs rookie entered the fourth quarter with just over eight minutes remaining and hit a 3-point shot for his only bucket of the period.