By Simon Evans and Martyn Herman BURNLEY, England (Reuters) -Liverpool rode their luck in a 1-0 victory over West Ham United in the Premier League on Saturday to turn up the heat on leaders Manchester City, who face a derby showdown on Sunday. Sadio Mane’s 12th league goal of the season, tucked away midway through the first half, proved just about enough to secure the win as Liverpool narrowed City’s lead at the top to three points with both teams having 11 games left to play. Liverpool manager Juergen Klopp, asked if he would be taking a close interest in City’s game with fourth-placed Manche…