Australia's share market has suffered one of its biggest falls in years, with nearly $40 billion wiped out as Greece inches towards a default on its debt and a potentially catastrophic exit from the euro zone.
Health stocks have soared after the Supreme Court upheld a key provision of President Barack Obama's health care reform, but the broader market has fallen on worries of a Greek default.
The Australian dollar is slightly higher against the greenback which was little moved overnight after the release of mixed US data and no progress in Greece debt talks.
US stocks followed European equity markets lower, dropping sharply on signs of fresh tension during talks between Greece and its international creditors aimed at preventing a Greek debt default.
The Australian dollar is lower after the attention of global markets remained on Greece and its long-running debt negotiations, which stalled again overnight.
The Australian share market has closed slightly better than flat as a rise in overseas markets reflected optimism about a bail-out deal for debt-ridden Greece.
The Australian dollar has nudged lower against a firmer greenback following the release of positive US housing data and comments from the US Federal Reserve.
Australian shares notched up a third consecutive day of gains on global optimism about the Greek government striking a debt bailout deal to avoid leaving the eurozone.
The Nasdaq has ploughed to a fresh record as US stock markets followed European equity markets higher on increased optimism for a deal that could avert a Greek default.
The Nasdaq has powered to a fresh record, easily topping the prior all-time high in a broad rally that withstood signs that a Greek debt default could be moving closer.
Wall Street stocks have risen after the US Federal Reserve kept its near-zero benchmark interest rate unchanged and Chair Janet Yellen pledged a methodical approach to raising rates.
The Australian dollar is higher, buoyed by weakness in the US dollar which fell after the US Federal Reserve's meeting failed to spell out the timing of an interest rate hike.