8. -- Twitter has acquired MoPub, a startup that helps mobile publishers manage their ad inventory, TechCrunch reported. MoPub was acquired for a reported $350 million in stock, TechCrunch reported. 9. -- Verizon ( VZ) is expected to raise $20 billion or more Wednesday in what would be the largest-ever debt sale by a company, The Wall Street Journal reported. Verizon will sell debt ranging in maturity from three to 30 years. The deal would help fund Verizon's $130 billion buyout of U.S. wireless joint-venture partner Vodafone ( VOD). 10. -- Rafael Nadal beat top seed Novak Djokovic, 6-2, 3-6, 6-4, 6-1, to win his second US Open and 13th Grand Slam title. -- Written by Joseph Woelfel >To contact the writer of this article, click here: Joseph Woelfel >To submit a news tip, send an email to: email@example.com.