SHANGHAI (AP) ― Andy Roddick understands that nobody is about to storm the offices of tennis leaders. Yet he believes the game’s top players remain intent on taking their grievances to the ATP tour.

Roddick has been among the most vocal proponents for a collective response to complaints about the tour, notably the length of the season and the number of tournaments players must enter.

The issues came to a head during the rain-soaked U.S. Open when Rafael Nadal, Andy Murray and Roddick voiced concerns about the conditions of the courts and the condensed schedule that forced Nadal to play three matches in three days. Roddick has floated the idea of forming a players’ union similar to those in other major pro sports. And Murray said last month that a strike couldn’t be ruled out.