London: Arsenal's Premier League title jitters returned in a potentially costly 2-2 draw at West Ham United on Sunday as for the second week in a row they threw away a two-goal advantage.
The leaders were 2-0 up and cruising towards restoring their six-point cushion over Manchester City with Gabriel Jesus tapping home in the seventh minute and Martin Odegaard doubling Arsenal's lead with a volley three minutes later.
But everything changed when they conceded a sloppy penalty that Said Benrahma tucked away in the 33rd minute.
West Ham, needing points themselves to stay away from the relegation zone, were transformed although Bukayo Saka had the chance to restore Arsenal's two-goal lead early in the second half only to blaze a penalty well wide.
That miss looked even more costly moments later when Jarrod Bowen volleyed in West Ham's equaliser in the 54th minute.
Just as at Anfield last week when Mikel Arteta's team led 2-0 but ended up hanging on desperately for a 2-2 draw with Liverpool, there was a nervousness about Arsenal's play as the pressure of winning a first title since 2004 intensifies.
City's destiny is now very much in their own hands as Arsenal lead the table with 74 points from 31 games, four more than City who have played a game less and who host Mikel Arteta's Arsenal side on April 26.
West Ham, who looked the stronger side after levelling and hit the crossbar through Michail Antonio, have 31 points from 30 games, four ahead of the relegation places.
Arsenal had won all five of their London derbies away from home this season without conceding a goal and had lost only two of the previous 29 league games against West Ham.
That record looked set to continue in a sparkling start but when the fulltime whistle sounded Arsenal's players looked crestfallen at losing their grip on the title race.
They remain in a position that they could have hardly imagined back in August but with City steaming up behind them after collecting 25 points from the last 27 on offer, the odds are shifting towards Pep Guardiola's treble chasers.
An intricate move in the seventh minute ended with Ben White's pass being tapped in by Jesus and with West Ham looking dazed, unmarked Odegaard volleyed in Gabriel Martinelli's cross.
West Ham got a lifeline when Thomas Partey was robbed by Declan Rice and Gabriel then took down Lucas Paqueta and Benrahma coolly beat Aaron Ramsdale from the spot.
Antonio's handball early in the second half gave Saka the chance to calm Arsenal's nerves but he made a hash of his penalty. West Ham's fans were then in raptures as a lofted ball forward found Bowen unmarked and he showed great composure to bounce a volley past Ramsdale.