| | Event type
Doubles (Guadalajara), Mixed
| Date | 17 – 19 October 1968 |
|---|---|
| Status | Olympic (non-medal) |
| Location | Guadalajara Country Club, Guadalajara / Atlas Sports Club, Guadalajara / Guadalajara Sports Club, Guadalajara |
| Participants | 24 from 8 countries |
This event was won by the US team of Julie Heldman and Herb Fitzgibbon, defeating the West German pair of Helga Niessen and Jürgen Faßbender in the final. Fitzgibbon played tennis at Princeton, but was never among the very best American players, and was better known as a platform tennis player. Heldman would later win 22 professional tournaments, but never made a Grand Slam final.
Round One
| Date | 17 October 1968 |
|---|---|
| Format | Winner of each match advanced to the quarter-finals. |
| Match | Date/Time | Pair | NOC | Result | Pair | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | Ziegenfuss / McManus |  USA | bye | ||||
| Match #2 | Niessen / Faßbender |  FRG | – | Zenes (MEX) / Nerell (SWE) |  MIX | walkover | |
| Match #3 | 17 Oct | Darmon / Darmon |  FRA | 6-0, 6-1 | Ycaza / Olvera |  ECU | |
| Match #4 | Jansone / Korotkov |  URS | – | Rosado / Osuna |  MEX | walkover | |
| Match #5 | 17 Oct | Bartkowicz / Osborne | USA | 6-4, 6-1 | Montaño / Loyo Mayo | MEX | |
| Match #6 | 17 Oct | Buding / Buding | FRG | 6-3, 3-6, 8-6 | Guzmán / Guzmán | ECU | |
| Match #7 | 17 Oct | Heldman / Fitzgibbon | USA | 5-7, 9-7, 6-2 | Petersen (BRA) / Di Domenico (ITA) | MIX | |
| Match #8 | Góngora / Zarazúa | MEX | bye |
Quarter-Finals
| Date | 18 October 1968 |
|---|---|
| Format | Winner of each match advanced to the semi-finals. |
| Match | Date/Time | Pair | NOC | Result | Pair | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 18 Oct | Niessen / Faßbender | FRG | 3-6, 6-1, 7-5 | Ziegenfuss / McManus | USA | |
| Match #2 | 18 Oct | Darmon / Darmon | FRA | 6-3, 6-4 | Jansone / Korotkov | URS | |
| Match #3 | 18 Oct | Bartkowicz / Osborne | USA | 6-8, 6-4, 6-3 | Buding / Buding | FRG | |
| Match #4 | 18 Oct | Heldman / Fitzgibbon | USA | 6-3, 6-4 | Góngora / Zarazúa | MEX |
Semi-Finals
| Date | 18 October 1968 |
|---|---|
| Format | Winner of each match advanced to the final. |
| Match | Date/Time | Pair | NOC | Result | Pair | NOC | |
|---|---|---|---|---|---|---|---|
| Match #1 | 18 Oct | Niessen / Faßbender | FRG | 3-6, 6-3, 6-4 | Darmon / Darmon | FRA | |
| Match #2 | 18 Oct | Heldman / Fitzgibbon | USA | 4-6, 11-9, 10-8 | Bartkowicz / Osborne | USA |
Final Round
| Date | 19 October 1968 |
|---|
| Match | Date/Time | Pair | NOC | Result | Pair | NOC | |
|---|---|---|---|---|---|---|---|
| Match 1/2 | 19 Oct | Heldman / Fitzgibbon | USA | 6-1, 6-3 | Niessen / Faßbender | FRG | |
| Match 3/4 | 19 Oct | Bartkowicz / Osborne | USA | 6-4, 7-5 | Darmon / Darmon | FRA |