In a season that has already yielded him six goals and an equal number of assists, Mamelodi Sundowns attacking midfielder Khama Billiat has warned the league that his best is yet to come. The Harare-born player has been leaving defenders in his wake and his contribution has led to Masandawana putting some distance between themselves and the chasing pack in the PSL.Billiat is delighted with his contribution to Sundowns and told Times Media yesterday: "I feel good, but at the same time I know there is a room for improvement."My finishing is not really on top, so there are positives and negatives about my game. I have to improve a lot. I always want to be better. I still want to score four or five [in a game], so I don't think I will ever be satisfied."In the end, I just want to contribute and see the team celebrate at the end of the season. We want the gold medals, so we don't want to be second-best."Speaking of Sundowns' attacking players, Billiat has been impressed by Colombian striker Leonardo Castro, who seems to be settling in well since joining the club last year. He has also scored six goals in this campaign."He's a very clever player who knows how to position himself in the box and he makes it easy for those who play around him. I'm sure it is not only me. We appreciate him," Billiat said.Sundowns' remarkable form in the last five months under coach Pitso Mosimane has seen them go 17 games without defeat and close to a club record an unbeaten run.But they are still a long way off the PSL record, achieved by Kaizer Chiefs 2014-2015 when they went 30 matches in all competitions without defeat.Sundowns' current best run is 19 matches unbeaten, achieved under Gordon Igesund on their way to winning the league title in the 2006-2007 season. Additional reporting by Nick Said..