THE Murray brothers will take on Australian pair Lleyton Hewitt and Sam Groth in today's crucial doubles rubber in the Davis Cup semi-final, it has been confirmed. With the World No 3 taking just 107 minutes to take care of Thanasi Kokkinakis in Friday's opening singles rubber, coach Leon Smith has taken the decision to alter his nomination for the doubles, where Dominic Inglot had originally been named to accompany Jamie Murray. The elder Murray sibling is in great form himself, having risen to No 8 in the world doubles rankings and reached the last two Grand Slam finals in his chosen discipline. The tie stands at 1-1 after Bernard Tomic's four-set singles win against Dan Evans, with either Belgium or Australia in the final.