Left-arm pacer Starc is the leading Australian wicket-taker with 18 wickets from six matches in the tournament so far.
"It will be a great contest as it involves two extremely competitive teams. India have shown a lot of consistency but at the same time Australia have a lot of quality in their ranks. It will be a good match but I will rate Australia's chances as slightly better in the semi-finals. I believe Mitchell Starc's performance could be a decisive factor," Marsh told PTI during an interaction today.
"It has been an incredible comeback for them in the World Cup after the Test and tri-series. They have really pulled it off well. It has been a collective effort. The batsmen have performed and the bowlers have done a splendid job for them so far. It is certainly not going to be easy for Australia. For Australia, the best part is that they bat deep," said Marsh, who has played 50 Tests and 117 ODIs for Australia between 1985 and 1992.
For him the relationship between the coach and captain is very important and believes that Ravi Shastri's presence has made a lot of difference to this current Indian team.
"Even though India lost the Test series, they fought well. It's not fair on my part to comment on coach-captain relationship in the Indian team but Ravi Shastri I feel has made a lot of difference to the set-up. Ravi himself has played a lot of international cricket and possesses an in-depth knowledge about the game. The inputs provided by him will certainly be of great value for the boys," said Marsh.