An intense competition is expected between two evenly-matched teams as India and South Africa gear up for the start of the two-Test 'Friendship Series' on Tuesday. However, the anticipated forecast and looming clouds over Centurion's SuperSport Park on Boxing Day pose a significant threat to the smooth start of the series. Regarded as the 'final frontier' because India are still without a Test series win in SA, the series also carries significance as part of World Test Championship.