The market has opened lower off mixed leads from Wall Street and Europe.

CommSec market analyst Steven Daghlian said uncertainty continues over a eurozone debt deal, amid Germany’s rejection of Greece’s loan extension request to the European Union.

“Greece is at the centre of the market’s tension at this stage,” he said.

The energy and mining sectors opened in the red following a slump in the oil and iron ore price, while company earnings continue to play a big role in the market’s behaviour.

Santos lost 26 cents or 3.2 per cent at $7.98 after releasing a dismal full year result.

The energy giant posted a $935 million loss after the slide in oil prices forced it to write down the value of its oil and gas assets.

Oil Search lost three cents to $8.39 and Woodside Petroleum was 66 cents lower at $35.47.

BHP Billiton dropped 19 cents to $32.31, Rio Tinto added 52 cents to $64.16 and Fortescue Metals was one cent higher at $2.52.

Telstra lost three cents at $6.58 on the news that CEO David Thodey is stepping down after six years in the job.

“Investors are showing a bit of caution – change always creates a bit of hesitation in the market,” Mr Daghlian said.

Medibank Private plunged 17 cents or 6.6 per cent at $2.39 after the newly-listed health insurer reaffirmed its full year guidance and lifted its half year profit 11 per cent.

The major banks lost ground, with ANZ losing three cents at $34.97, National Australia Bank down seven cents at $37.64, Westpac was five cents weaker at $37.90, while Commonwealth Bank fell eight cents to $91.06.

KEY FACTS

* At 1027 AEDT on Friday, the benchmark S&P/ASX200 index was down three points, or 0.05 per cent, at 5,901.2 points.

* The broader All Ordinaries index was down 3.9 points, or 0.07 per cent, at 5,865.9 points.

* The March share price index futures contract was nine points lower at 5,859 points, with 6,016 contracts traded.

* National turnover was 313 million securities worth $771 million.