| Championnat d'Europe - Doubles Mixtes | 04/29 07:20 | 4 | Labar R / Tran A v Jansen J R / Ostermeyer K | L | 2-1 | |
| Championnat d'Europe - Doubles Mixtes | 04/28 08:40 | 1 | Jansen J R / Ostermeyer K v Dremin E / Dimova E | W | 2-1 | |
| Orléans Masters - Doubles Mixtes | 03/25 16:10 | 4 | Jansen J R / Ostermeyer K v Christiansen M / Boeje A | L | 0-2 | |
| Orléans Masters - Doubles Mixtes | 03/24 10:15 | 5 | Magee S / Magee C v Jansen J R / Ostermeyer K | W | 0-2 | |
| Open d'Angleterre - Double Mixtes | 03/17 14:00 | 5 | Jansen J R / Ostermeyer K v Ellis/Smith | - | Cancelled | |
| Open de Suisse - Doubles Mixtes | 03/04 10:00 | 4 | Jansen J R / Ostermeyer K v Tan/Lai | L | 0-2 | |
| Open de Suisse - Doubles Mixtes | 03/02 16:45 | 5 | Jansen J R / Ostermeyer K v Orteu Y / Muller A | W | 2-1 | |
| European Team Championships XD | 02/17 17:20 | - | Nohr/Magelund v Jansen J R / Ostermeyer K | L | 2-1 | |
| Thailand Open XD | 01/19 04:50 | 5 | Chan P S / Goh L Y v Jansen J R / Ostermeyer K | L | 2-0 | |
| Thailand Open XD | 01/13 06:40 | 5 | Jansen J R / Ostermeyer K v Ellis/Smith | L | 0-2 | |
| SaarLorLux Open 2019, XD | 10/29 17:15 | 4 | Geiss/Efler v Jansen J R / Ostermeyer K | L | 2-1 | |
| SaarLorLux Open 2019, XD | 10/28 13:15 | 7 | Jansen J R / Ostermeyer K v Mikkelsen/Søby Hansen | W | 2-0 | |
| Denmark Open XD | 10/14 08:30 | 5 | Jansen J R / Ostermeyer K v Ellis/Smith | L | 0-2 | |
| Masters d'Espagne - Doubles Mixtes | 02/20 09:40 | 4 | Jansen J R / Ostermeyer K v Bay-Smidt / Soeby H. | L | 1-2 | |
| Masters d'Espagne - Doubles Mixtes | 02/19 11:00 | 5 | Adcock C / Adcock G v Jansen J R / Ostermeyer K | W | 0-2 | |
| Italian Int. XD | 12/13 08:00 | - | Hybel E / Magnusson J v Jansen J R / Ostermeyer K | D |
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| SaarLorLux Open 2019, XD | 10/29 15:00 | 5 | Nohr N / Thygesen S v Jansen J R / Ostermeyer K | L | 2-0 | |
| Dutch Open XD | 10/08 16:20 | 5 | Jansen J R / Ostermeyer K v Christiansen/Boje | L | 1-2 | |
| Belgian Int. XD | 09/13 16:30 | 2 | Lane B / Pugh J v Jansen J R / Ostermeyer K | L | 2-0 | |
| Belgian Int. XD | 09/13 08:00 | 3 | Jansen J R / Ostermeyer K v Adam E / Lambert M | W | 2-0 | |
| Belgian Int. XD | 09/12 10:55 | 4 | Jansen J R / Ostermeyer K v van Der Lecq T / Jille D | W | 2-1 | |
| Kharkiv International 2019, XD | 09/07 07:00 | 3 | Jansen J R / Ostermeyer K v Delrue F / Heriau V | L | 1-2 | |
| Kharkiv International 2019, XD | 09/06 11:40 | 4 | Atrashchenkov V / Zharka Y v Jansen J R / Ostermeyer K | - | Walkover | |
| US Open 2019, XD | 07/10 01:10 | 5 | Ko S H / Eom H W v Jansen J R / Ostermeyer K | L | 2-0 | |
| Canada Open XD | 07/05 00:10 | 4 | Lee / Hsu v Jansen J R / Ostermeyer K | L | 2-1 | |
| Canada Open XD | 07/03 23:40 | 5 | Jansen J R / Ostermeyer K v Chiu V / Chi B | W | 2-0 | |
| Spanish Int. XD | 06/14 07:00 | - | Jansen J R / Ostermeyer K v Mairs G / Moore J | L | 0-2 | |
| Open de Pologne - Doubles Mixtes | 03/30 14:30 | - | Lane B / Pugh J v Jansen J R / Ostermeyer K | L | 2-0 | |
| Open de Pologne - Doubles Mixtes - Qualif. | 03/28 08:00 | - | Jansen J R / Ostermeyer K v Graalmann H / Petrikowski J | W | 2-0 | |
| Orléans Masters - Doubles Mixtes | 03/20 08:40 | 5 | Jansen J R / Ostermeyer K v Labar R / Tran A | L | 1-2 |