You tap “by 2s,” type $5 and think you have a five-dollar bet. Then the slip shows a fifteen-dollar total.
Nothing mysterious happened. You bought three separate two-pick parlays at $5 each. That is a round robin: a group of smaller tickets made from your selections.
The format can return money when one selection loses. It can also cost more than you intended, or pay something back while still leaving you down overall. Start by counting the tickets.
Rules and sources checked October 27, 2026, at 8:05 a.m. EDT. Every selection, stake and price below is hypothetical. Examples assume separate eligible events, ordinary cash stakes, no fees or promotions, and no pushes or voids.
Three picks “by 2s” means three tickets
Call your selections A, B and C. Choosing all the two-pick combinations creates:
Three selections · doubles only
One selection list. Three separate bets.
Total stake: $15. Each pair needs both picks to win.
A appears on two tickets, B on two, and C on two. If C loses, the A+C and B+C tickets lose. A+B can still win. If only A wins, none of the doubles wins.
DraftKings' round-robin guide uses this same three-pair structure for a two-pick round robin. The important distinction is the combination size you selected, not just the number of names in the slip.
Multiply the stake by the ticket count
The basic cost calculation is stake per combination × number of combinations. bet365's guide explains that each generated parlay is a separate wager.
| Selections | Two-pick tickets | At $5 each |
|---|---|---|
| 3 | 3 | $15 total |
| 4 | 6 | $30 total |
| 5 | 10 | $50 total |
| 6 | 15 | $75 total |
Adding one selection can add several tickets. Moving from three selections to four doubles your ticket count from three to six. Keeping the $5 entry doubles the total stake, too.
Work backward from your total budget. If your total is $30 and the slip contains six doubles, that is $5 per double. The final stake shown by the sportsbook is the number to review before placing anything.
A payout is not automatically a profit
Use our three doubles at $5 each: $15 total risk. First, suppose each individual selection is +100, or 2.00 decimal. A two-leg parlay that multiplies those decimal odds is 4.00, returning $20 on a winning $5 stake.
If A and B win but C loses, only A+B pays. You receive $20 total and subtract the $15 spent across all three tickets. The overall profit is $5.
Now change all three individual prices to -200, or 1.50 decimal. Each double is 2.25 decimal, so a winning $5 pair returns $11.25. With the same two winners and one loser, you receive $11.25 against a $15 total stake. You got a payout and still lost $3.75 overall.
The number of winning selections alone does not establish profit. The actual prices, winning combinations and total stake do. Our parlay payout guide explains the difference between total return and net profit.
Compare formats with the same total stake
Here is the tradeoff using three hypothetical +100 selections. Compare a single $15 three-leg parlay with the $15 round robin above, split into three $5 doubles.
| Picks that win | $15 three-leg parlay | Three $5 doubles |
|---|---|---|
| All 3 | $120 | $60 |
| Exactly 2 | $0 | $20 |
| 0 or 1 | $0 | $0 |
The doubles leave a way to get paid with exactly two winners. The single three-leg ticket has the larger return when all three win. Neither structure improves the underlying selections or guarantees value.
And the doubles are connected: a losing C damages two tickets at once. Three tickets do not mean three unrelated chances.
Read the options, not just the “round robin” label
“By 2s” and “all combinations” can mean different total purchases. In DraftKings' three-selection example, all combinations adds the three-leg parlay to the three doubles. That is four bets. At $5 apiece, the total becomes $20.
Eligibility matters as well. FanDuel Ontario's rules do not permit round robins containing selections from the same event. Do not assume three player props from one game will behave like three eligible selections from separate games.
Pushes and voids can change how component parlays settle. FanDuel's parlay rules, for example, recalculate remaining selections after a void. Use the rules for the sportsbook and market on your actual ticket; do not count a refund or reduced parlay as a normal win.
Keep the accounting as clear as the picks
Before placing a round robin, be able to say the combination size, ticket count, stake per ticket and total stake in one sentence. “Three doubles at $5 each, $15 total” is clear. “Five dollars on these three” is not.
Afterward, add the returns from the winning component tickets and subtract the total amount risked. Record that result in your betting log. Calling a round robin a win because one pair cashed can hide an overall loss.
BetSlip Live helps you import supported sportsbook slips, review the legs and follow live progress. For a round robin, keep the sportsbook's component-ticket breakdown alongside your tracking so the total stake and final result stay clear. BetSlip Live does not accept wagers.