Song: "Heartbreaker"
Artist: Grand Funk Railroad
Peak position on the Cashbox Singles chart: #72
Number of weeks on the Cashbox Singles chart: 6
(5 weeks in the Top 100)
Weekly data:
| Week ending | Rank | Title | Artist | Label |
|---|---|---|---|---|
| January 31, 1970 | 105 | Heartbreaker | Grand Funk Railroad | Capitol 2732 |
| February 7, 1970 | 97 | Heartbreaker | Grand Funk Railroad | Capitol 2732 |
| February 14, 1970 | 88 | Heartbreaker | Grand Funk Railroad | Capitol 2732 |
| February 21, 1970 | 81 | Heartbreaker | Grand Funk Railroad | Capitol 2732 |
| February 28, 1970 | 75 | Heartbreaker | Grand Funk Railroad | Capitol 2732 |
| March 7, 1970 | 72 | Heartbreaker | Grand Funk Railroad | Capitol 2732 |
Rankings greater than 100 are from the Cashbox 'Looking Ahead' charts.