Wall Street's overnight performance was lacklustre, with a sharp fall in oil prices weighing on the broader market.

Tesla was the worst-performing stock on the Nasdaq index after chief executive Elon Musk used Twitter to fire off online abuse at one of the British cave divers involved in the rescue of 12 Thai children last week, calling him a "pedo".

Its shares closed 2.75 per cent lower at US$310.10.

In after-hours trading, the electric car maker's stocks fell even further to $US307 (at 5:50pm, local time).

The drop in Tesla's share price has knocked almost $US2 billion off its market value.

Markets at 7:15am (AEST): ASX SPI 200 futures -0.2pc to 6,180, ASX 200 (Monday's close) -0.4pc at 6,242

ASX SPI 200 futures -0.2pc to 6,180, ASX 200 (Monday's close) -0.4pc at 6,242 AUD: 74.2 US cents, 56 British pence, 63.3 Euro cents, 83.3 Japanese yen, $NZ1.10

AUD: 74.2 US cents, 56 British pence, 63.3 Euro cents, 83.3 Japanese yen, $NZ1.10 US: Dow Jones +0.2pc at 25,064, S&P 500 -0.1pc at 2,798, Nasdaq -0.3pc at 7,806

US: Dow Jones +0.2pc at 25,064, S&P 500 -0.1pc at 2,798, Nasdaq -0.3pc at 7,806 Europe: FTSE -0.8pc at 7,600, DAX +0.2pc at 12,561, CAC -0.4pc to 5,409, Euro Stoxx 50 -0.2pc at 3,449

Europe: FTSE -0.8pc at 7,600, DAX +0.2pc at 12,561, CAC -0.4pc to 5,409, Euro Stoxx 50 -0.2pc at 3,449 Commodities: Brent crude -4.5pc at $US71.94/barrel, spot gold -0.1pc at $US1,240.07/ounce, iron ore +0.8pc at $US64.56/tonne

A number of analysts and investors, requesting anonymity, said that Mr Musk's comments are adding to their concerns that his public statements are distracting him from Tesla's main business of producing electric cars.

The billionaire entrepreneur's spat with British diver Vernon Unsworth started last week.

Rescue teams rejected Mr Musk's offer of a mini-submarine created by his rocket company SpaceX to help rescue the 12-member junior soccer team and their coach trapped inside a flooded cave in the northern province of Chiang Rai.

"He can stick his submarine where it hurts," CNN reported Mr Unsworth as saying.

"It just has absolutely no chance of working."

Mr Musk shot back on Sunday, via Twitter:

"We will make one (video) of the mini-sub/pod going all the way to Cave 5 no problemo. Sorry pedo guy, you really did ask for it."

The Tesla chief gave no evidence for alleging Unsworth was a paedophile, and the tweet was later deleted.

Mr Unsworth said he would consider taking legal action against Mr Musk over the remarks.

Elon Musk deleted tweets attacking the diver.

Bank surge fails to lift broader market

As corporate earnings season kicked into full swing, the broader US market struggled to make gains.

The Dow Jones index rose by just 0.2 per cent to 25,065 points.

The S&P 500 fell slightly by 0.1 per cent, while the Nasdaq fell by 0.3 per cent.

The energy sector weighed on Wall Street's overnight performance, due to a steep fall in oil prices, offsetting a surge in financial stocks.

Bank of America shares surged 4.3 per cent after it posted quarterly earnings which surpassed market expectations.

Goldman Sachs shares jumped 2.3 per cent ahead of its results, which are out on Tuesday (local time).

But this was outweighed by Brent crude prices sliding 4.5 per cent to a three-month low, which sank energy giants like Exxon Mobil (-1pc) and Chevron (-0.9pc).

Oil prices fell as the market is expecting a surge in supply.

Russia and other oil producers could raise output by 1 million barrels per day (bpd) or more if shortages hit the market, Russian Energy Minister Alexander Novak said.

Also weighing on futures were reports the United States could tap its emergency Strategic Petroleum Reserve, which would add further supply to the market.

Of the 30 S&P companies that have reported their earnings so far, 87 per cent of them have beaten expectations — above the 75-per cent average of the past four quarters.

Facebook, Amazon and Google fell more than 1 per cent in after-hours trading. The stocks have led the technology and consumer discretionary sectors back to record-high levels in recent days.