Investors braced for choppy trade Friday, with U.S. stocks opening flat to slightly lower as the focus remained on U.S.-China trade talks. The S&P 500 shed 0.2%, while the Dow industrials rose around 3 points, or less than 0.1%. The Nasdaq Composite declined 0.2%. All three indexes are on track for weekly declines. However, the small-cap Russell 2000 is on track for a weekly rise after pushing back into record territory earlier this week.