US STOCKS-Wall St slumps at open as China, Greece weighs
* Greece has until Sunday to agree a new bailout plan
* China stock sell-off raises fears of economic slowdown
* Microsoft slips on report of job cuts
* Tesla drops on second rating cut in two days
* Indexes down: Dow 0.88 pct, S&P 0.80 pct, Nasdaq 0.87 pct (Updates to open)
By Tanya Agrawal
July 8 (Reuters) - U.S. stocks slumped at the open on Wednesday, pushing the bluechip Dow Jones Industrial average into negative territory for the year, as Chinese markets slid further and as the Greece debt crisis dragged on.
The decline also pushed the Nasdaq Composite index to its lowest level in two months and the S&P 500 index to its lowest level in over four months.
Beijing unveiled yet another battery of measures to arrest the sell-off in shares and the securities regulator warned of "panic sentiment" gripping investors in the world's second-largest economy. Continuación...