<h2>Al Riffa Biggest Threat to Melbourne Cup Favourite Half Yours – Trifecta Summary:</h2> <p>&nbsp;</p> <p>- &nbsp; Half Yours shares&nbsp;<a href="https://www.sportsbet.com.au/futures/horse/melbourne-cup-9582177">Melbourne Cup favouritism</a> on Sportsbet, alongside Valiant King following his Caulfield Cup triumph.</p> <p>- &nbsp; Trainer Calvin McEvoy identifies international raider Al Riffa as the biggest threat to his stable star's Cup hopes.</p> <p>- &nbsp; Expected rain at Flemington could play into Half Yours' hands as the gelding thrives on rain-affected tracks.</p> <p>&nbsp;</p> <h2>Melbourne Cup Odds Tighten as Favourites Emerge</h2> <p>&nbsp;</p> <p>The Melbourne Cup betting markets have crystallised with Caulfield Cup winner Half Yours sharing favouritism alongside Chris Waller's Bart Cummings Stakes winner, Valiant King.</p> <p>At the time of writing, both horses sit neck and neck on Sportsbet, reflecting the competitive nature of this year's field.</p> <p>Calvin McEvoy, who co-trains Half Yours, acknowledges the strength of competition facing his stable star in Tuesday's 3200-metre feature. The trainer's biggest concern isn't the fellow favourite but rather an international challenger yet to race in Australia.</p> <p>"I'm scared the most of Al Riffa who we haven't seen out here yet," McEvoy revealed. "He's a quality horse, he's a proven traveller, a proven Group 1 winner, proven stayer, he's got the pedigree, he handles the soft ground."</p> <p>The Joseph O'Brien-trained Al Riffa represents the international challenge that has historically proven formidable in Melbourne Cup betting markets.</p> <p>The gelding's proven staying credentials and adaptability to different track conditions make him a legitimate threat to the local favourites.</p> <p>&nbsp;</p> <h2>Half Yours Primed for Melbourne Cup Challenge</h2> <p>&nbsp;</p> <p>Following his impressive Caulfield Cup victory, Half Yours has reportedly thrived in the aftermath of his Group 1 success. McEvoy insists his charge has "bounced through" the tough Caulfield assignment and is "asking for more" ahead of the Melbourne Cup.</p> <p>The trainer's confidence stems from Half Yours' versatility and improving trajectory. Having never disappointed connections, the gelding heads to Flemington with question marks remaining about his ultimate ceiling.</p> <p>"We don't know where the ceiling is with him," McEvoy explained. "He's never let us down and the weather looks ideal for him."</p> <p>Weather conditions could play a crucial role in Melbourne Cup odds as rain is forecast for Flemington. McEvoy believes these conditions favour his runner, noting that while rain-affected tracks can slow some horses, Half Yours "doesn't slow down, he gets better."</p> <p>&nbsp;</p> <h2>Race Dynamics Could Favour the Favourite</h2> <p>&nbsp;</p> <p>The Caulfield Cup form line provides intriguing insights for Melbourne Cup punters. Half Yours was forced to work harder in that victory, while second-placed River Of Stars and third-placed Valiant King enjoyed more economical runs.</p> <p>McEvoy expects different race dynamics at Flemington will allow a more conservative approach. "A different race shape at Flemington, we can be a bit more conservative, let the race unfold, trust the Flemington straight, trust our horse's fitness and let him chime in at the right time."</p> <p>Beyond the joint favourites, McEvoy has identified several other contenders worthy of respect in the Melbourne Cup betting. Presage Nocturne's recent performance caught his attention, while he expects improvement from Meydaan in the Cup.</p> <p>Jamie Melham, who guided Half Yours to Caulfield Cup glory, retains the ride for the Melbourne Cup. The combination will attempt to become the latest Caulfield-Melbourne Cup double, a feat that remains one of racing's most challenging achievements.</p> <p>With the Melbourne Cup field finalised and conditions looking ideal for the favourite, Tuesday's race shapes as a fascinating betting proposition for punters seeking value in one of Australia's most competitive handicaps.</p>