Ninja Casino
Sports betting
Checked · 2 Sep 2026
US Open — 10% cashback up to €25
Enter code OPEN26 and enable insurance on the bet slip. Your first losing qualifying tennis bet earns 10% back in bonus money, up to €25, with 2× wagering.
- Cashback
- 10%
- Minimum odds
- 1.60
Offer ends: 14 Sep 2026
What you need to do
- Activation
- Requiredenter the code and enable cashback insurance
- Promotion code
- OPEN26
- Participation requirement
- applies to the first losing qualifying slip; Cash Out may qualify under the described calculation
- Eligible market
- pre-match or live, tennis singles or multiples
TÄRING rating explained
Drawbacks
- Cashback must be activated beforehand and the bonus money wagered twice, making it harder to turn into cash.
How the rating is formed
Reward value40
Ease of qualifying42
Reward attainability32
Flexibility52
Freedom to use the reward68
Methodology 0.4.1 · The TÄRING editorial team is responsible for this rating.
What you receive
- Cashback
- 10%first losing qualifying bet
- Refund limit
- 25 €
Important restrictions
- Wagering requirement
- 2×cashback bonus money
- Wagering basis
- cashback bonus money
- Minimum odds
- 1.60each event on a wagering bet slip
- Reward form
- bonus funds
- Reward validity
- 3 dayswagering deadline from activation
Eligibility and dates
- Who can take part
- Existing customers
- Starts
- 23 Aug 2026
- Ends
- 14 Sep 2026, 23:59 Estonian time
Available at
Sources and checking information
Checked: 2 Sep 2026. Sources may be in Estonian.