WASHINGTON — Mike O'Connor had a lot of friends and family rooting him on.

"It felt a little weird knowing everybody was watching me," he said. "I just tried to focus on the game and making pitches and tried not to worry about that."

O'Connor won for the second time in three starts since joining the Nationals' rotation, getting a two-run homer from Jose Guillen in the Washington Nationals' 5-4 win over the Pittsburgh Pirates on Sunday.

A 2002 graduate of George Washington University with a degree in finance, O'Connor (2-1) allowed three runs, five hits and four walks in five innings, hitting two batters and throwing a wild pitch. He lost 6-2 at St. Louis in his major league debut on April 27, then won 6-2 at the New York Mets on May 2.

O'Connor said he got about 20 tickets for family and friends and that his parents purchased about another 100. His coach from Mount St. Joseph High School also brought his team from Baltimore.

"I knew there were a lot of people here to see me," O'Connor said. "I didn't really talk to anybody today, but it's definitely a different feeling knowing there's a lot of people here. I saw a lot of people while I was warming up. When I was walking out there, a lot of people were yelling at me that I've known.

O'Connor walked Jose Bautista to open the game and hit Nate McLouth, his second batter. After allowing a run-scoring double by Jason Bay and walking Craig Wilson, he got out of a bases-loaded jam by striking out Ronny Paulino.

"It was definitely a little shaky early, but I was able to get through some innings without giving up too much," O'Connor said. "I was able to make pitches when I needed to. It was definitely good to get out of that with just giving up one run early."

Pittsburgh stranded six runners in the first three innings and 11 overall.

"The kid has a lot of heart," Nationals manager Frank Robinson said. "He doesn't back down and doesn't back off. He seems to get a little tougher when things get a little tough. I saw some of that in the first two games he started and I really saw it today in the first inning."

Washington took a 5-1 lead in the third when Nick Johnson hit a two-run single, Guillen followed with his third homer, and Ryan Zimmerman and Matthew LeCroy hit consecutive doubles that gave the Nationals four straight hits.

"Nick gets jammed and bloops one in there, and we score a couple," Robinson said.