JOHANNESBURG, Feb 7 (Reuters) - South African Richard Sterne, looking to go one better than his runner-up finish at last week's Dubai Desert Classic, fired an eight-under 63 to share the Joburg Open first-round lead on Thursday. The 31-year-old, playing on his home Royal Johannesburg and Kensington Golf Club, produced six birdies and a chip-in eagle at the ninth to join German rookie Maximilian Kieffer at the top of the leaderboard.