A poker hand with all five cards in sequence by rank, all of the same suit. The second best hand you can have in poker. Example: 6 -5 - 4 - 3 - 2 of spades or J -10 - 9 - 8 -7 of hearts. If 2 players have a straight flush, the player holding the highest card will win. An Ace can be a high card, as in the case of a Royal flush A-K-Q-J-T, or a low card and can be counted as a 1 in the case of a 5 - 4 - 3 - 2 - A of the same suit.