Mateusz Demczyszak

| European Junior Championships

| Kaunas, Lithuania

| 5th

| 3000 m s'chase

| 8:57.24

| European U23 Championships

| Debrecen, Hungary

| 9th

| 3000 m s'chase

| 8:55.30

| European Championships

| Barcelona, Spain

| 8th

| 1500 m

| 3:44.42

| European Indoor Championships

| Paris, France

| 12th (h)

| 1500 m

| 3:47.67

| European Championships

| Helsinki, Finland

| 10th (h)

| 1500 m

| 3:43.97

| European Indoor Championships

| Gothenburg, Sweden

| 13th (h)

| 3000 m

| 7:59.41

| Moscow, Russia

| 29th (h)

| 3000 m s'chase

| 8:34.60

| IAAF World Relays

| Nassau, Bahamas

| 6th

| 4 × 1500 m

| 15:05.70

| Zürich, Switzerland

| 10th

| 3000 m s'chase

| 8:34.32

| European Indoor Championships

| Prague, Czech Republic

| 22nd (h)

| 3000 m

| 8:09.30

| Nassau, Bahamas

| 4th

| Distance medley relay

| 9:24.07