Brian Roberts has played in eight home openers at Camden Yards, and none has felt quite like this one. From a rousing ovation for Orioles managers past and present to the excitement from the stands for an undefeated baseball team to Roberts' one big swing that carried the Orioles to a 5-1 victory over the Detroit Tigers, the home opener at Camden Yards was a rousing success. A sellout crowd of 46,593, which enjoyed a game-time temperature of 76 degrees, watched Jake Arrieta continue the early roll of the Orioles' rotation, Roberts continue his RBI binge with his tie-breaking three-run homer in the fifth inning and the home team continue its winning ways. The Orioles' 4-0 beginning equals their best start since 1997, and they are one win shy of tying the 1970 club, which won its first five games. "I don't think anybody's ever had a bad 4-0 start. It's been awesome," said Roberts, who drove a 1-2 pitch from Rick Porcello just over the right-center-field wall with no outs in the fifth. "Certainly, I've been through a lot -- we all know that -- and I think with the expectations coming into this year, to still be able to go out there and do that, I think it's been great for us." The Orioles are off Tuesday, giving them a little extra time to enjoy their surprising start and ponder how they can build on it when they seemingly lose a key player on a daily basis. Top starter Jeremy Guthrie, who got things started with eight shutout innings in Friday's series-opening victory over the Tampa Bay Rays, was to spend Monday night in the hospital as he recovered from what the team thinks is a form of pneumonia. He'll miss at least one start, forcing Brad Bergesen into the rotation about four days earlier than originally expected. But that will be a worry for another day. Orioles manager Buck Showalter told his players to focus on getting away from baseball, but undoubtedly the good sentiment will linger. The Orioles didn't win their fourth game last year until April 27, the 20th game of the season.