South Africa got their Africa Cup of Nations campaign on track with a much-improved performance to secure victory against Angola in Group A.Centre-back Siyabonga Sangweni volleyed in at the far post to score Bafana's Bafana's first goal of the tournament.The hosts, who drew with Cape Verde in their opener, dominated against Angola yet lacked a cutting edge.But they got a second goal when Lehlohonolo Majoro slotted past the keeper from a tight angle.