Between 2002 and 2005, Roberts faced a difficult time in developing the new four-stroke 990cc Suzuki GSV-R bike to challenge Honda and Yamaha. He was also being challenged by his younger teammate, John Hopkins, who often outperformed him. Even in 2003 and 2004, Hopkins managed to finish the season ahead of Roberts. During the 4-year period, Roberts managed to gain only two podiums, one in 2002 and one in 2005. At the end of 2005, Suzuki decided not to renew Roberts' contract and opted for a younger rider in Chris Vermeulen.