Manchester City manager Pep Guardiola is wary of his side getting too over-excited. © AFP Manchester City and Liverpool are showing no signs of letting up in their thrilling Premier League title race but their flawless form contrasts sharply with the struggles of the teams chasing a top-four finish. Manchester United host Chelsea on Sunday hoping to arrest an alarming slide of seven defeats in nine games in all competitions. But it is only thanks to the poor form of Maurizio Sarri’s men and Arsenal, who have suffered back-to-back defeats against Crystal Palace and Wolves, that Manchester United remain in the hunt for Champions League football next season, just three points off the top four.United’s latest defeat to City on Wednesday lifted the defending champions one point ahead of Liverpool with three games left for both sides.That stretched City’s winning streak in the league to 11 games, with the last slip-up by either of the title contenders remarkably now nearly two months ago, when Liverpool were held at Everton.Liverpool have already surpassed their club-record points tally in the Premier League era, with 88, and Jurgen Klopp’s side are expected to retake top spot when already relegated Huddersfield visit Anfield on…