U.S. diversified stock funds returned to the winner’s circle, halting their one-week skid. They accomplished that feat by eking out a 0.19% advance on average in the week ended May 7. about rising crude oil prices and Greece’s ongoing standoff with its creditors. Greece is due to make a payment next week. Stocks sank on Wednesday amid comments by Federal Reserve chair Janet Yellen suggesting that stocks are generally overpriced.