Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
which Surface has Opponents in the final of mark edmondson sherwood stewart, and a Tournament of dallas , u.s.?

### Inputs:
table_name: table, columns: ['Outcome', 'Date', 'Tournament', 'Surface', 'Partner', 'Opponents in the final', 'Score in the final']

### Response:
SELECT Surface FROM table WHERE Opponents in the final = mark edmondson sherwood stewart AND Tournament = dallas , u.s.