Oak win at Wickers
Darryl Livesey's volley, from Scott Carden's corner, took a deflection off Southwick's Jack Hayward to give Oak the lead a minute into the second half.
Danny Molineaux headed Wickers level from Wayne Joseph's corner on 55 minutes, but two minutes later Oak went back ahead.
Advertisement
Hide AdAdvertisement
Hide AdMark Curram was brought down in the penalty area by Conor McCurdy and Carden scored from the spot.
Oak keeper Aaron Stenning made two outstanding saves to keep his side ahead, before Oak's Keiron Howard had his injury-time penalty brilliantly saved by Southwick keeper Gareth Cook.
In Division 1, John O'Hara League Cup winners Shoreham were held to a 0-0 draw at Worthing United.