Leicester's side looks every bit as effective as their 2016 title-winning squad.
Tottenham were lucky to even escape with a point as Sheffield United impressed once more to move up to fifth.
However, that may change on Sunday when the Reds and Liverpool collide at Anfield (4.30pm).
The Blues started the month with a 4-1 victory away to Southampton before a 1-0 home win against Newcastle and ended the month with a 4-2 win at Burnley.
Lampard said, "Some games as a striker in the Premier League will frustrate you because good defenders won't give you much space, so there's a problem for Tammy to solve".More news: Japan 'specs ban' for women at work sparks backlash
Many have suggested that England midfielder Oxlade-Chamberlain should start against the Premier League champions this weekend, the 26-year-old having scored four goals in his past three starts as he continues to work his way back from a long-term injury that saw him miss virtually the entirety of last season.
He added: "It was a proper Premier League game with two quality sides".
"Obviously after that, it was very hard for us to get back".
McGoldrick thought he had equalised just two minutes after Son's opener, but VAR replays showed that Lundstram's toe had been marginally offside in the build-up - a decision that was so close it took nearly four minutes to make.
While Sheffield United sit proudly in the top six, Tottenham - Champions League finalists in June - are stuck in 12th spot, without a league win since September.More news: Police say dad, daughter kidnapped woman, who was found in California desert
"The reality is that for different reasons we are not showing the performances that we expect", said Spurs boss Mauricio Pochettino.
Maddison's goal was set up by Jamie Vardy, who leads the Golden Boot race with 11 goals after he opened Leicester's account against the Gunners but his team-mate thinks there's more to his game than goals.
"He was a very important player during his football career. We've allowed him to do essentially what he wants to do", he said. "I have no criticism of them in any shape or form".
West Ham's misery was complete when keeper Roberto Jimenez punched Ashley Westwood's corner into his own net.More news: Free State unhappy with Springbok World Cup trophy tour snub
But Richarlison struck the victor 15 minutes from time to secure Everton's first away league win since March.
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