<p>Trainer Aidan O'Brien has yet to announce plans for the Eclipse on Saturday, and whether son Joseph, right, will be riding. Photograph: Matthew Stockman/Getty</p><p>Mars appears likely to be the sole runner for Aidan O'Brien's Ballydoyle stable in the Eclipse Stakes at Sandown on Saturday, bookmakers reported on Tuesday. The final shape of the race will only be known when the Irishman declares his hand and, as so often before, he is leaving it late to decide between his three entrants.</p><p>If Mars lines up, he is likely to be ridden by Ryan Moore, as Joseph O'Brien, the trainer's son and principal jockey, is too heavy to do the colt's allotted weight of 8st 10lb. If O'Brien Jr were to ride in the Eclipse, it could only be on Declaration Of War or Camelot, the yard's other two entrants, so it is at least interesting that he has agreed to ride Fury for the Newmarket trainer William Haggas in another race on the card, indicating that he expects to be at Sandown.</p><p>However, David Stevens, representing the bookmakers Coral, who sponsor the card, said: "If the money's any guide, then Mars will be Ballydoyle's sole representative. He's down to 9-2 now, having been 8-1 at the weekend and it's great that he'll represent the Classic generation." Mars is the last three-year-old left in the Eclipse and no horse as young has been placed since 2010.</p><p><a href="http://www.guardian.co.uk/sport/2013/jul/02/aidan-obrien-eclipse-stakes-mars">Keep reading...</a></p><p>Read also:</p><p><a href="http://www.rte.ie/sport/racing/uk/2013/0701/459952-obrien-trio-remain-in-coral-eclipse/">Aidan O'Brien's Declaration Of War among eight still standing in Coral Eclipse</a> (RTE.ie)</p><p><a href="http://www.sportinglife.com/racing/news/article/465/8801161/fine-forecast-ahead-of-eclipse">Fine forecast ahead of Eclipse</a> (Sportinglife.com)</p><p><a href="http://www.independent.ie/sport/horse-racing/camelot-spearheads-ballydoyle-challenge-for-eclipse-honours-29387508.html">Camelot spearheads Ballydoyle challenge for Eclipse honours</a> (Irish Independent)</p><p>Explore: <a href="http://news.google.com/news/more?ncl=dm_WmKd46x4Ik5McywdjGjaFdsTIM&ned=us">10 additional articles.</a></p>
