ST MARTIN, Italy - F1 leader Nico Rosberg expects his rocky relationship with Mercedes team mate and title rival Lewis Hamilton to improve despite the rift between them after the 2014 Monaco Grand Prix.Rosberg won the showcase race on Sunday (May 25) to retake the championship lead from Hamilton, who suggested the German had used underhand tactics during Saturday qualifying to score pole position.Rosberg, visiting the German soccer team during its World Cup preparations in Italy on Tuesday (May 28), said such disputes between drivers of the same team were nothing new.WARNING FROM BOSSES"In our sport we can only have success as a team," Rosberg told a news conference. "Nothing can happen alone. I make an effort for teamwork and for the atmosphere in the team."It's a bit more difficult internally at the moment but it has happened in the past."Mercedes bosses have warned both drivers that they must not overstep the mark in their increasingly intense fight for the F1 title with the team having won every race so far in 2014."We discuss the issues and we have already discussed them and it will again be better and it will be forgotten," said Rosberg, who has known Hamilton since they were teenage team mates in karts.Before the German's second victory of the season, which put him four points clear of 2008 F1 Drivers' champion Hamilton after six of the 19 races, his British rival had won four in a row. Stay with Wheels24 for the 2014 F1 season – fresh reports every day.