MEXICO CITY, Mexico -- If it stays dry, the Mexican Grand Prix is going to be all about strategy. The big question is whether drivers one-stop or two-stop, with Mercedes, Red Bull and Ferrari already making their first move in Q2 when they decided which compound to start the race on. Red Bulls choice to use the super-softs when they had the pace to use the softs suggests they are targeting a two-stop, whereas Mercedes and Ferrari will start on the soft, potentially giving them a long enough first stint to make a one-stop work.Fridays practice data suggests a two-stop (or even three-stop) is the quickest way to complete the 71 laps, but the cooler conditions two days ago were causing the two softest compounds to grain and therefore lose performance. Graining was not such a big problem in Saturdays hotter conditions, so if its hot on Sunday a one-stop becomes more realistic whereas overcast conditions are likely to favour the two-stop.The risk of the two-stop is that you get dropped into traffic after each pit stop and lose time. Traffic for a number of laps at this circuit has the potential to negate the performance benefit of the new tyres and the overall speed of the strategy. A one-stop has no such risks and allows the team to better cater for a potential safety car period by keeping its options open for longer.The key to the one-stop is the medium tyres, which were experiencing next to no degradation on Friday and in some cases were getting quicker as the fuel load and the stint went on. If Mercedes, for example, one-stop they can make their single tyre change at a point when they know they will maintain track position at the front. With track position secure and overtaking difficult, even a quicker car coming up behind on a two-stop is unlikely to be a threat.The other aspect of the two-stop v one-stop debate is the start. By starting on the super-softs, Red Bull will have more startline grip for the long run down to Turn 1. If they can get ahead of the Mercedes and build a gap, they could start to enjoy the pace benefit of the two-stop and force Mercedes to try to undercut on a two-stop strategy of their own. Leading out of Turn 1 will be crucial to controlling the race.Pirelli recommends the following numbers of laps are not exceeded on each compound: Medium = NO LIMIT suggested Soft = 22 laps Super Soft = 18 lapsOn this basis, the possible pit-stop strategies predicted by Pirelli are as follows:QUICKEST Two-stopper: 2 stints on soft (19 laps on new tyres) + 1 stint on medium of 33 laps Also possible (very close) Three-stopper: 2 stints on super soft (15 laps on new tyres) + 2 stints on soft of 20 and 21 lapsSECOND-QUICKEST Three-stopper: 1 stint on super soft (8 laps on used tyres) + 3 stint on soft of 21 lapsSLOWEST One-stopper: 1 stint on soft (22 laps on new tyres) + 1 stint on medium of 49 laps Different permutations of compound usage within each strategy are possible.With those strategies, and the one-stop mentioned above, in mind, here are the tyres each driver has left for the race. 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He accepted earlier this week and the team made the announcement Friday. Delta Bluesman won the $100,000 Hall of Fame Stakes at Parx Racing as a heavy favorite Saturday, but his supporters werent counting their money until the closing yards of the five-furlong sprint.Delta Bluesman can reliably be found on the lead in his races but in the Hall of Fame he was outsprinted for the top by Pomeroys Package - the longest price in the five-horse field at 33-1 - and Rainbow Heir, the 5-2 second choice.On the far turn, Always Sunshine moved up outside the leaders and 3-5 Delta Bluesman was blocked behind them. Jockey Emisael Jaramillio thought about splitting horses but then had to steady nearing the stretch. He took Delta Bluesman inside the trio in upper stretch and was up in the final sixteenth to win by a length.Delta Bluesman, owned by Monster Racing Stables and trained by Jorge Navarro, paid $3.60 and was timed in 57.45 seconds. Pomeroys Package came oon again late to be second, a neck ahead of Rainbow Heir, who appeared to take a short lead nearing the sixteenth pole.ddddddddddddIt was a head back from Rainbow Heir to Always Sunshine in fourth.Delta Bluesman has now crossed the wire first in five of his last six races, even though in May he was disqualified from the win in the Decathlon Stakes at Monmouth Park. In July, he scored his biggest career victory with Jaramillio aboard in the Grade 2 Smile Sprint at Gulfstream Park. The only time he failed to finish first this summer came when he was fourth in the Grade 1 Vanderbilt Handicap at Saratoga.A $30,000 claim by Navarro in October 2014 at Gulfstream Park West, 6-year-old Delta Bluesman is now 10 for 45 in his career with earnings of $511,437. ' ' '