Not Mark Prior

GAME 51 PREVIEW CHICAGO CUBS (26-24) at LOS ANGELES DODGERS (26-25) Dodger Stadium, 9.10pm CT, TV: ESPN2, FSN2

SP Derrek Lowe	SP *John Koronka
SS #Neifi Perez	SS #Cesar Izturis
3B #Enrique Wilson	3B Antonio Perez
1B Derrek Lee	CF *JD Drew
RF *Jeromy Burnitz	2B Jeff Kent
2B *Todd Walker	1B Olmedo Saenz
CF *Corey Patterson	RF Jayson Werth
LF Todd Hollandsworth	C Jason Phillips
C Michael Barrett	LF Mike Edwards
Pitcher's spot	Pitcher's spot

The Cubs' system is chock-a-block with pitching. Yet filling in today for the Mark Prior as the Cubs try to run the streak to a season-high six with a first sweep of the Dodgers in LA for a decade will be a real non-prospect making his major league debut. Koronka's not yet 25, but he's already into the eighth season of a minor league career over which he has a 4.41 ERA. If that doesn't say it all for his talent, his fastball doesn't reach the nineties, and his only quality off-speed offering is his changeup. The Cubs' decision to add him to the 40-man roster last November was then at best rather bizarre. Their decision to actually use him in a major-league game today probably borders on capitulation (of course, now that I've forecast him getting tatooed left, right and centre, watch for him throwing shutout ball). Strangely the decision makes some sense though. Besides Sergio Mitre, of all our prospects only Angel Guzman and Jerome Williams are refined enough to comfortably handle the jump to the majors. The diagnosis on Guzman though is a strained right forearm, and at best he'll only throw his first pitches since the spring in a few days' time. Jerome Williams meanwhile has struggled terribly of late, and the decision to place him for a while at Iowa, where he last night threw six solid innings (2 runs on 8 hits, 1 crushed home run that was only just fair, no walks and 4 strikeouts), is entirely the correct one in my view - he needs some confidence running through his veins again. Behind Guzman and Williams lies a whole host of talent, led by Renyel Pinto, Ricky Nolasco and Rich Hill from West Tennessee. Calling them up would though represent really throwing them in at the deep end, sink or swim, since not one of the three has a successful inning at Triple-A under their belt. Is that the wisest way to treat prospects? It's debatable. Of the more experienced options, the Cubs' decision to leave Todd Wellemeyer and Ryan Dempster, who've both started games this year, in the bullpen where they seem to have found a groove is probably wise. Though he only throws in the mid-eighties, Raul Valdez, signed out of the Dominican Republic last year, throws a wide variety of pitches at a wide variety of speeds from the left side, but he would be going on short rest today and he'd require someone being kicked off the forty. Jon Leicester meanwhile started a previous emergency start, but he was roughed up a bit by the Mets in that game and he's lost Dusty's faith. And that really leaves just Koronk-urgh. It's not ideal, but for today, it'll have to do. Hopefully the offence shows up, hopefully Valdez or Leicester can start next time around, and hopefully Mark Prior gets well soon. Roll on, Cubbies, roll on. [UPDATE Rob G.] I'm going to try and do a running diary of the game (twins permitting), updating every half inning or so.