Chambers started all 16 games in 2003, becoming the first Dolphins wide receiver to do so since Oronde Gadsden in 2000. He finished the season with 64 catches for 963 yards and 11 touchdowns, leading the team in all three categories. His reception total tied for 14th in the AFC, while his yardage figure ranked seventh. He tied for fifth in the conference in overall touchdowns and was first in the AFC and third in the NFL in receiving scores. Chambers accounted for the most catches by a Dolphin since 1999 when Tony Martin had 67 receptions. Chambers' yardage total was the most by a Dolphin since Martin had 1,037 yards in 1999, and his 11 touchdowns were the most since Mark Clayton hauled in 12 receiving scores in 1991. Of Chambers' 64 receptions, eight went for 25 yards or longer, topping the team. Over the course of the season, he led the team in receptions nine times and in receiving yards on nine occasions. His average per reception of 15.0 tied for the ninth-highest figure among the top 50 receiving yardage leaders in the AFC. He also rushed for 30 yards on four attempts on the year.