Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Statistic | Name | Total | School | Opponent | Stage |
| --- | --- | --- | --- | --- | --- |
| Most points | Kevin Alas | 43 | Letran | SSC-R | 2012 Semifinals |
| Most rebounds | Calvin Abueva Calvin Abueva | 23** 21 | SSC-R SSC-R | SanBeda Letran | 2009 Finals 2012 Semifinals |
| Most assists | Michael Gonzales Jayson Castro | 10 | SSC-R PCU | CSB UPHDS | 2002 Finals 2004 Finals |
| Most steals | RJ Jazul | 8 | Letran | JRU | 2008 Semifinals |
| Most blocks | Mark Andaya Sam Ekwe | 7* 6 | Letran SanBeda | PCU PCU | 2004 Semifinals 2006 Finals |
Question:
Calvin Abueva Calvin Abueva had what statistic?
Answer:
Most rebounds