In the latest shift in a sports management business that appears to be trending toward the boutique, Roger Federer has joined with his longtime agent Tony Godsick and two American investors to form an agency called Team8.

The company, based in the Cleveland area and headed by Godsick, will represent the interests of Federer, the 32-year-old Swiss tennis star, who is one of the world’s highest-earning and most popular athletes. But Team8 also has signed one of Federer’s main rivals, the fifth-ranked Juan Martín del Potro of Argentina, with input from Federer, who spent considerable time with del Potro on an exhibition tour of South America last year.

Grigor Dimitrov, a rising 22-year-old Bulgarian whom many tennis experts view as a potential Grand Slam champion, confirmed in an email that he would also join Team8, effective Jan. 1.

That would give the new agency a strong foothold in both the present and the future of tennis and would be a symbolic move for the 23rd-ranked Dimitrov, a player who was once nicknamed Baby Fed and whose flowing, all-court game and one-handed backhand have long elicited stylistic comparisons with Federer.