Stocks opened lower Wednesday after economic growth slowed to a crawl in the first quarter. GDP increased 0.2%, a big step down from the fourth quarter's 2.2% growth. That could give the Federal Reserve pause ahead of its statement to be released later in the day. MasterCard (MA) moved higher after beating quarterly earnings as profit increased 17%. Time Warner sales increased nearly 5% from a year earlier. The entertainment giant was boosted by March Madness programming at its Turner segment. GoPro (GPRO) surged after reporting strong demand for its Hero4 action camera. The company also provided a better-than-expected forecast for second-quarter growth.