Asian markets made tentative gains early Monday as investors waited to see the outcome of Greece's negotiations with creditors over its debt situation.

Most markets in the region edged higher—the Nikkei Stock Average was up 0.8%, Singapore's Strait Times rose 0.7% and the Hang Seng Index rose 0.3%. Australia's S&P ASX 200 fell 0.4%, led down by large banks like Commonwealth Bank of Australia and National Australia Bank Ltd., which dropped nearly 1.5% each.

China's mainland market was closed Monday for a national holiday. Shanghai stocks fell 13% last week, their worst weekly selloff since the global financial crisis.

European leaders are meeting in an emergency summit on Monday to discuss Greece. The euro is expected to slump if Athens fails to reach an agreement with creditors, which could lead to buying of safe-haven assets like the Swiss franc and the Japanese yen. The Japanese yen was at 122.68 against the U.S. dollar, strengthening from 122.70 late Friday in New York.

Markets are likely to remain in a holding pattern over the next few days as investors watch developments in Greece. Tim Condon, an economist with ING in Singapore, noted the outcome is still uncertain, putting pressure on Asian equities in particular. "I think we'll go down to the wire one this," Mr. Condon said.

The International Monetary Fund and eurozone governments have been keeping Greece afloat with emergency loans for the past five years, but Greece needs urgent financial help to avoid it defaulting on a loan repayment to the IMF on June 30.

For now, the euro has remained robust against the dollar, in large part because of indications from the U.S. Federal Reserve that it will move slowly raising interest rates. The yen gained 0.6% last week against the dollar, also given expectations the U.S. won't raise rates aggressively, making other assets more attractive by comparison.

Write to Chao Deng at Chao.Deng@wsj.com

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