Ritchie scored one of the biggest goals in Anaheim Ducks history when he got the winner in Game 7 of their Western Conference Second Round series against the Edmonton Oilers on May 1, 2017, sending the Ducks into the conference final. It was the highlight of a solid NHL rookie season for the emerging power forward.
The Ducks took Ritchie in the first round (No. 10) of the 2014 NHL Draft after he finished with 74 points (39 goals, 35 assists) for Peterborough of the Ontario Hockey League. He signed an entry-level contract with the Ducks on Aug. 2, 2014, and turned pro a year later. After putting up 30 points (16 goals, 14 assists) in 38 games with San Diego of the American Hockey League in 2015-16, Ritchie earned a midseason call-up to the Ducks. He became a regular in 2016-17, finishing with 18 points (14 goals, 14 assists) despite averaging less than 13 minutes of ice time in 77 games.