Lexie wants Meredith to have sex with Derek so he'll be nicer to her now that she's on his rotation. Sounds like a plan! But Mer is summoned away to OB duty where she delivers a baby for a woman who has an inoperable brain tumor. This brand new mom only has six months to live. Meredith wants Derek to do a consult. But since they can't talk engage in neuro-talk, she sends Lexie in to do her dirty work.
Derek wants to operate on that inoperable tumor. The new parents are nervous. Meredith has a heart-to-heart chat with the dad (behind Derek's back, of course). The guy's scared, but eventually gets on board with the idea of surgery. It's touch and go for awhile. The tumor is smart, but the surgeons attacking it are smarter. Soon the tumor is gone and a grateful, teary-eyed dad is telling his new baby girl that she now has a mom for good.
When you're a fifth year resident, every surgery you do goes on your record—the good and the bad. Speaking of the bad, Alex has had five surgeries go south on him lately. That's why he's looking to improve his batting average by doing an easy open-heart procedure. But the 71-year-old patient doesn't want a scar. It'll affect his abilities to attract the ladies at the pool. Makes sense.