Of course for a bout as big as this there are more markets than just the "to win" market. and the "method of victory" market is certainly more interesting. Here we find Pacquiao priced at 4/5 to win inside the distance or at 7/4 to win a decision, suggesting that the bookies don't believe Algieri will last the distance. As for Algieri to win you can back him at 12/1 to win a decision or a huge 18/1 to win inside the distance.
With Pacquiao favoured for the stoppage it should be no surprise that the bout isn't expected to go the distance with odds of 4/6 on the bout ending inside the schedule and 7/5 to go the 12 rounds.