The Greenbrier Classic's latest additions beefed up the field further, both in the current and historical sense.Classic officials announced Wednesday via Twitter the additions of Vijay Singh, Carl Pettersson, Camilo Villegas and Jamie Lovemark.Pettersson, once dubbed the "Swedish Redneck" by countryman Jesper Parnevik, will be a three-time Classic participant. His stock is much greater this time around, though.He is enjoying the best of his 10 generally solid years on the PGA Tour, winning nearly $2.5 million so far. In April, he won the RBC Heritage at Hilton Head Island, the fourth of his career, and he is 10th in the FedExCup standings.That gives the Classic half the top 10 in the tour's points race, and 15 of the top 30. Petterson has climbed to 40th in Official World Golf Ranking, giving the Classic 13 of the top 50.Vijay Singh's commitment gives the Classic a third World Golf Hall of Fame member, joining Tom Watson and Phil Mickelson. A native of Fiji, Singh has won 34 tour events, including the 2000 Masters and two PGA Championships, and won the 2008 FedExCup.Villegas, the Colombian known for his unorthodox "Spiderman" pose in lining up putts, has won three tour events. He made the cut in his only Classic last year, but finished tied for 71st.Lovemark was the top player on the Nationwide (now Web.com) Tour in 2010, but back surgery cut his rookie season short.He has kept his tour card on a major medical exemption, but is earning just under $100,000 in 14 starts this year. Under terms of his extension, Lovemark has two starts to make $536,362, or else he loses his tour status.Players have until 5 p.m. Friday to apply for entry into the field. Shortly after that deadline, the official field will be released.Reach Doug Smock at 304-348-5130, firstname.lastname@example.org, or follow him at twitter.com/dougsmock.