Pittsburgh Pirates vs. Washington Nationals  TUESDAY MAY 19, 2009 The Washington Nationals will be fighting to snap a losing streak on Tuesday when they take on the Pittsburgh Pirates at Nationals Park. The Pirates will give the ball to starter Jeff Karstens in this one. Righthander Karstens is 1-2 this season with a 5.06 ERA. It'll be Shairon Martis toeing the rubber for the Nationals in this contest. Righthander Martis is 5-0 with a 4.10 ERA so far this season. Oddsmakers currently have the Nationals listed as 150-moneyline favorites versus the Pirates, while the game's total is sitting at 10. Craig Monroe homered and drove in three runs on Monday night to lead the Pirates to a 12-7 win over the Nationals. The Pirates got the victory as +110 road underdogs in that contest, while the combined score went well OVER the night's posted total (10). Delwyn Young and Jack Wilson drove in two runs apiece for Pittsburgh in that victory. Nick Johnson picked up three RBI in a losing cause for the Nats. Current streak: Pittsburgh has won 3 straight games. Washington has lost 5 straight games. Team records: Pittsburgh: 17-21 SU Washington: 11-26 SU Pittsburgh most recently: When playing on Tuesday are 3-7 Before playing Washington are 7-3 After playing Washington are 5-5 After a win are 6-4 Washington most recently: When playing on Tuesday are 3-7 Before playing Pittsburgh are 4-6 After playing Pittsburgh are 4-6 After a loss are 3-7 A few trends to consider: The total has gone OVER in 5 of Pittsburgh's last 7 games when playing Washington Pittsburgh is 5-2 SU in its last 7 games The total has gone OVER in 6 of Pittsburgh's last 9 games when playing on the road against Washington Pittsburgh is 5-11 SU in its last 16 games when playing on the road against Washington The total has gone OVER in 5 of Washington's last 5 games The total has gone OVER in 5 of Washington's last 5 games at home The total has gone OVER in 5 of Washington's last 7 games when playing Pittsburgh Washington is 11-5 SU in its last 16 games when playing at home against Pittsburgh