ATP players want a significant prize-money increase at the Masters events, with talks currently ongoing between tournament and player reps on the ATP Board.
"We are looking for more, yes," Eric Butorac, vice president of the ATP Player Council, told ESPN.com.
The agreements are up for renewal this year, following the previous three-year agreement to increase prize money by nine percent a year. Butorac said a bigger increase is sought this time because the tournaments grew twice as much as expected during this period.
"Even with their nine percent [prize money] increase," he said, "as a total unit, they grew at a seven percent rate per year."
According to *SportsBusiness Journal*, the players want prize money at Masters tournaments doubled within four years, but the tournaments want a smaller increase.
The move follows the players' success in getting large prize-money increases from the majors, especially during the first few rounds. Wimbledon raised prize money by nearly 40 percent a year ago, and the U.S. Open is on schedule to double the amounts it offered in 2012.
The popularity of the "Big Four" is also seen as having benefited Masters events, which all top players must play. Smaller events, which top players are not required to participate in, have not been as successful. As a result, the players argue, they should receive a share of the extra amounts.
"So I think just with the way the top players are playing, and the ability to have a tournament that contains players like Nadal, Federer, Djokovic, Murray, it's just so valuable," said Butorac. "Those tournaments have really thrived. So we hope we can be compensated adequately."
The goal is to reach a "mutually agreeable place and nothing drastic happens," he said, seemingly referring to the possibility of collective action from the players.