In an effort to monetize its broadcasting app Periscope, Twitter has partnered with retired tennis champ Andy Roddick for a series of broadcasts during the U.S. Open. Roddick is broadcasting gameplay commentary and answering audience questions from his Twitter handle. Also, marking the first ad campaigns on Periscope, Chase and Grey Goose are serving as sponsors. “JPMorgan Chase, which is an official U.S. Open sponsor, was drawn to Roddick’s Periscope broadcasts during Wimbledon,” reports Variety. “When he started Periscoping during Wimbledon, it was clear to us that is a change in how people will watch sports,” said CMO Kristin Lemkau.