NEW YORK — Three days after signing with the Warriors, Matt Barnes will start Sunday against the Knicks. Golden State head coach Steve Kerr decided to replace Patrick McCaw in the starting lineup with Barnes to have a bigger, more experienced player match up against Carmelo Anthony. [...] he is one of only four active NBA players to have played for nine NBA teams. Stephen Curry visited a dentist Saturday afternoon in Manhattan after experiencing discomfort. The dental issue doesn't appear serious, and the two-time reigning NBA MVP is available Sunday against the Knicks. "He's good to go," Kerr said of Curry, who is 4-of-31 from three-point range in his past three games. Connor Letourneau is a San Francisco Chronicle staff writer.