baker hughes reported a big pop in north american earnings but had weaker margins overseas. shares of b.h.i., rowan and nabors each fell more than 7%. yahoo has been under pressure to reignite its growth. today, the company was in a buying mood. yahoo shares dropped 5% after announcing it would buy online ad company interclick. interclick shares jumped 21%, closing just below the $9 closing price. exelixis shares plummeted 40%. the company will launch experiments for a prostate cancer treatment, but without a deal with the f.d.a. on certain guidelines. the worry is that without the okay, it reduces the treatment's chances for regulatory approval. and that's tonight's "market focus." >> susie: this year's world series is turning out to be more than just a hit for fans. the seven-game championship is also hitting economic home runs for the cities and for major league baseball. in tonight's "beyond the scoreboard," rick horrow steps up to the plate for a look at the financial perks of the fall classic. >> reporter: after putting together an improbable post- season run, the st.