FORMER Davis Cup player Mark Bailey has committed himself to the Hong Kong Sports Institute for at least two years - just as another prominent coach ends his term in the territory. As Hong Kong Sports Institute tennis co-ordinator, Bailey, 31, has signed a contract that will keep him at his present post until July, 1996. But he feels local tennis will miss the services of his former Davis Cup teammate Michael Walker, the Hong Kong Tennis Association's coaching director who is soon expected to take up a coaching post in Britain. Bailey and Walker currently play parallel roles in the Institute-Association's streamlined development programme. Bailey said: ''We have all worked really hard in recent months. We have been getting more players under one roof. ''It is a good situation at the moment and an excellent environment for tennis to flourish. ''I'm upset that Mike is leaving. He has done a great deal for Hong Kong tennis. It is a pity he is going because we have worked hard to bring the whole thing together.'' Walker previously worked with Bailey at the Institute before being appointed the association's coaching director in 1992. Bailey said the Institute's scholarship programme is back on track almost a year since it nearly collapsed following the resignation of former head tennis coach, Australian Geoff Masters. The Institute has 18 scholarship athletes, five of whom have recently been placed in an elite squad. The players train at both the Institute and Victoria Park, where the association is based. The departure of Walker may see Bailey return to the Davis Cup fray, having been shunned earlier this year after 11 years of non-stop service. But he said his immediate concern is to work with the Institute's juniors. He is hoping to enter a group of boys into a series of satellite tournaments in Indonesia this month.