US STOCKS-Futures higher after strong earnings reports
* Futures up: Dow 19 pts, S&P 3 pts, Nasdaq 12 pts
By Tanya Agrawal
July 24 (Reuters) - U.S. stock index futures were higher on Friday after three straight days of losses as Amazon, Visa and Starbucks beat expectations.
* Amazon.com shares jumped 18.3 percent to $570.56 in premarket trading, a day after the online retailer posted an unexpected quarterly profit.
* Dow component Visa was up 4.7 percent at $75.15 after the credit and debit card company's results handsomely beat expectations.
* Starbucks rose 4.3 percent to $59 after the world's biggest coffee chain reported a higher quarterly profit.
* U.S. stocks ended lower on Thursday, with the blue-chip Dow Jones industrial average slipping back into the red for the year, after disappointing corporate results and forecasts added to concerns about the U.S. profit outlook.
* Second-quarter S&P 500 earnings have been mixed, with 75 percent of companies so far beating analysts' profit expectations but just 52 percent surpassing revenue expectations, according to Thomson Reuters data.
* Adding to the concerns regarding lukewarm earnings, the S&P 500 is relatively expensive, trading at 16.9 times forward 12 months' earnings, above the 10-year median of 14.7 times, according to StarMine data. Continuación...