. >> reporter: it hasn't been done since 1988 when steffi graf scored the last grand slam. this year, the 33-year-old powerhouse has already won the australian open. the french open. >> oh, williams! >> reporter: and a nail-biter at willabledon. >> next stop, new york. >> reporter: she comes home with hopes of becoming truly grand. and this is hers to win. she has no clear rival. the only thing standing between her and history is herself. mary bruce, abc news, at the u.s. open in new york. >> and robin robert ts will have more of her interview with veern th serena. >>> that's what's making news in america this morning. >> here's what's happening on this august 31st. >> a man is in custody after an off-duty philadelphia police officer was killed in a hit-and-run crash. >>> a security breach at the newark/liberty airport prompts an evacuation. >> let's go over to karen rogers and matt pellman. >> reporter: good morning, we're starting off warm and muggy. we have light showers in the