U.S. crude fell for a second straight day as investors fled to safe havens and technical selling threatened to push oil into a bear market.
The euro fell more than 1 percent against a buoyant U.S. dollar on Tuesday.
Mainland shares led losses in a mixed trading session in Asia on Tuesday.
U.S. stocks closed mildly lower, recovering from sharp opening losses on selloff overseas, as traders shook off concerns of contagion from Greece.
Europe closed lower on Monday, after Greeks voted "no" to creditors' reform proposals and Greek Finance Minister Yanis Varoufakis resigned.
U.S. stock index futures indicated a lower open as worries over China's relentless selloff and Greece's debt crisis weighed on investor sentiment.
Oil prices fell sharply after Greece rejected debt bailout terms and as negotiators neared a deadline on Iran's nuclear program.
Gold turned higher on Monday as France and Germany told Greece the door was open to negotiations after Greek voters had voted no.
The euro tumbled across the board, but was off its lows, after Greece voted to reject the conditions tied to the country's debt bailout deal.
U.S. Treasurys rallied on Monday, after a "no" vote in a Greek referendum on the country's bailout terms fanned fears of Greece exiting the euro zone.
China was the lone bright star in Asia on Monday, after a 'No' vote in Greece ignited a wave of risk aversion.
European equities closed lower on Friday as investors looked ahead to Sunday, when a referendum that could affect Greece's future in the euro zone will take place.
U.S. stock index futures indicated a higher open, recovering some of the previous day's decline as investors eyed developments in Greece.
Oil prices dropped as a rising U.S. rig count stoked fears of oversupply and after Chinese regulators opened an investigation into suspected stock market manipulation.
Gold was steady above a 3-1/2 month low, as sluggish US jobs data tempered expectations for a September rate hike by the Fed and hurt the dollar.
The dollar stuck around as disappointing US jobs data and caution ahead of Greece's referendum on bailout conditions kept the market mood subdued.
Stock markets in China extended their selloff on Friday following news that securities regulators are investigating suspected market manipulation.
U.S. stocks ended little changed as investors eyed the jobs report and were on edge ahead of Greece's Sunday referendum.
U.S. stock futures indicated a lower open as uncertainty over Greece remained following a 'No' vote in a referendum on the nation's bailout terms.
Drillers added 12 oil rigs to U.S. fields in the last week, snapping a 29-week streak of declines.
Get the best of CNBC in your inbox
The movement called "The Beautiful Revolution" is ailing ahead of Dec. 6 legislative elections — including in Sabaneta, Hugo Chavez's hometown.
Turkey only procures oil and gas from known sources and those who accuse it of buying from ISIS need to prove it, President Erdogan said on Thursday.
Shares of Spanish renewables giant Abengoa were down around 25 percent, a day after the company began insolvency proceedings.