The duo was facing off during the Shanghai Sharks' 123-119 win against the Beijing Fly Dragons.
In the third quarter, Fredette was going to the rim with Marbury defending. Marbury slapped his hand at Fredette, knocking the ball away, but also hitting Fredette. Fredette took exception to the hit, yelling at Marbury. Marbury and Fredette then got chest-to-chest, exchanging verbal jabs. They eventually had to be separated. The Sharks led 82-81 with about a minute left in the quarter.
Fredette netted 54 points and had 13 rebounds and 10 assists for a triple-double. The former BYU star has averaged 50.3 points, nine rebounds and eight assists in his last three games.
Marbury, 40, last played in the NBA in 2008. He spent five years of his 13-year NBA tenure with the New York Knicks. The two-time All-Star was the No. 4 overall pick in the 1996 NBA Draft. Fredette, 28, was the No. 10 overall pick in the 2011 NBA Draft. He spent part of the 2015 season with the Knicks.
Fredette signed a new deal with the Sharks in July. He was the CBA International MVP last season.
Marbury is playing in his final season with the Fly Dragons. He won three CBA crowns with the Beijing Ducks and was the 2013 CBA International MVP.