Pirates-Diamondbacks: Here's what to look for

Here are some trends to keep an eye on this week during the Pirates four-game series at home against Arizona (Hint: Could be one of the last chances ever to see future Hall-of-Famer Randy Johnson pitch in person):

Friday: Ian Snell (Pittsburgh) vs. Brandon Webb (Arizona)
In case you haven't read this before, Snell hasn't won since April 12, a span of nine starts. … Arizona's Stephen Drew is 3-for-7 against Snell. … Webb is on a Cy-Young pace with a 10-2 record and 2.65 ERA entering the game. … Jason Bay is 0-for-12 lifetime against Webb while Nate McLouth is 4-for-6. Jose Bautista (3-for-4) and Adam LaRoche (3-for-10, HR, 2 RBI) have also had success vs. Webb.

Saturday: Tom Gorzelanny (Pittsburgh) vs. Dan Haren (Arizona)
Gorzelanny has had an up-and-down season but has won his last two starts at home and has given up only four earned runs in 12 1/3 innings in those starts. … He is 1-0 with a 2.77 ERA in two starts vs. Arizona. … Justin Upton had a double, triple and home run vs. Gorzelanny. … Mark Reynolds is 2-for-6 with a home run and two RBI but has struck out three times. … Doug Mientkiewicz is 4-for-12 with two doubles off Haren, who is 2-0 with a 2,60 ERA in three starts against the Pirates. … Jason Michaels is 4-for-9 lifetime vs. Haren.

Sunday: Phil Dumatrait (Pittsburgh) vs. Doug Davis (Arizona)
Dumatrait is making his first career start against Arizona. … He was a hard-luck loser in his last start when he allowed two runs in six innings but the Pirates were shut out for the first time this season. … Davis is making his fourth start since returning from having a cancerous thyroid gland removed. … In 19 career games, mostly with Milwaukee, Davis is 6-5 with a 4.98 ERA vs. Pittsburgh. … Jack Wilson is 15-for-45 with four doubles and four RBI vs. Davis. Freddy Sanchez is batting .500 (16-for-32) with a home run and three RBI.

Monday: Zach Duke (Pittsburgh) vs. Randy Johnson (Arizona)
Duke has not had much success against Arizona, going 0-1 with a 6.55 ERA in two starts. … Chris Burke is 4-for-13 with two doubles vs. Duke while Chris Snyder is 3-for-5 with three RBI. … The "Big Unit" is making his 15th career start vs. the Pirates and is 9-5 with a 2.21 lifetime ERA vs. Pittsburgh. … He has averaged 7 1/3 innings a start vs. the Pirates. … Xavier Nady is 5-for-16 with a home run and five RBI vs. Johnson while Chris Gomez is 12-for-40 with a home run and five RBI. … Johnson moved past Roger Clemens and into second place on the all-time strikeouts list with 4,680. He has struck out 141 Pirates batters in 101 2/3 innings.