Arsenal and Chelsea are nine points behind Premier League leaders Liverpool after their 1-1 draw on Sunday, while Ipswich stunned Tottenham 2-1 for their first Premier League victory in 22 years.

Arsenal are now winless in four Premier League games, as their bid for a first title since 2004 is at risk of unravelling.

The Gunners welcomed captain Martin Odegaard back to the starting line-up for the first time in two months and were much improved at Stamford Bridge, but still could not come away with a vital three points.

"We were very unlucky. We have dominated one of the best teams in Europe but we don't get the results – that is what is missing," said Arsenal boss Mikel Arteta after the derby at Stamford Bridge.

Odegaard teed up Gabriel Martinelli to open the scoring with a near-post shot on the hour mark.

Chelsea responded through Pedro Neto's brilliant long-range effort for his first league goal since a US$66 million move from Wolves.

But Arsenal manager Mikel Arteta has two new worries to add to what he describes as a nightmare run of injuries, after Bukayo Saka and Declan Rice both failed to finish the match.

Rice went off after 71 minutes, and Saka was replaced 10 minutes later with both sustaining knocks.

"It doesn't look good because for two players of that importance to say they want to come off is unusual," Arteta told reporters. "I don't expect them to be fit for the international break."

A share of the spoils sees the Blues remain ahead of Arsenal on goal difference as both sides move into the top four.

Meanwhile, Ipswich will play host to Ruben Amorim's first match as Manchester United manager in two weeks, and go into that game buoyed by their first win since ending a two-decade wait to return to the top flight.

"It's a massive moment – one to cherish," said Ipswich boss Kieran McKenna.

Sammie Szmodics took advantage of statuesque Tottenham defending to open the scoring with an overhead kick on 31 minutes.

Liam Delap doubled the visitors' lead in far less spectacular fashion as he lashed in from point-blank range after Radu Dragusin directed a cross towards his own goal.

Spurs had come back to win in eight of the previous 12 league matches they conceded first at home this year but this time left themselves with too much to do.

Rodrigo Bentancur reduced the arrears with a powerful header from Pedro Porro's corner but they fell to a fifth league defeat in 11 games.

Ipswich move out of the relegation zone at Crystal Palace's expense, while Spurs slip to 10th. (AFP/Reuters)