diff --git a/src/benchmark/benchmark_result.rs b/src/benchmark/benchmark_result.rs
index b37f725..10ff0a8 100644
--- a/src/benchmark/benchmark_result.rs
+++ b/src/benchmark/benchmark_result.rs
@@ -1,20 +1,20 @@
 use std::collections::BTreeMap;
 
-use serde::Serialize;
+use serde::{Deserialize, Serialize};
 
 use crate::util::units::Second;
 
 /// Set of values that will be exported.
 // NOTE: `serde` is used for JSON serialization, but not for CSV serialization due to the
 // `parameters` map. Update `src/hyperfine/export/csv.rs` with new fields, as appropriate.
-#[derive(Debug, Default, Clone, Serialize, PartialEq)]
+#[derive(Debug, Default, Clone, Serialize, Deserialize, PartialEq)]
 pub struct BenchmarkResult {
     /// The full command line of the program that is being benchmarked
     pub command: String,
 
     /// The full command line of the program that is being benchmarked, possibly including a list of
     /// parameters that were not used in the command line template.
-    #[serde(skip_serializing)]
+    #[serde(skip)]
     pub command_with_unused_parameters: String,
 
     /// The average run time
@@ -46,6 +46,6 @@ pub struct BenchmarkResult {
     pub exit_codes: Vec<Option<i32>>,
 
     /// Parameter values for this benchmark
-    #[serde(skip_serializing_if = "BTreeMap::is_empty")]
+    #[serde(default, skip_serializing_if = "BTreeMap::is_empty")]
     pub parameters: BTreeMap<String, String>,
 }
diff --git a/src/benchmark/scheduler.rs b/src/benchmark/scheduler.rs
index 941fa5a..bce7cd2 100644
--- a/src/benchmark/scheduler.rs
+++ b/src/benchmark/scheduler.rs
@@ -22,12 +22,13 @@ impl<'a> Scheduler<'a> {
         commands: &'a Commands,
         options: &'a Options,
         export_manager: &'a ExportManager,
+        results: &'a Vec<BenchmarkResult>,
     ) -> Self {
         Self {
             commands,
             options,
             export_manager,
-            results: vec![],
+            results: results.to_vec(),
         }
     }
 
@@ -69,6 +70,14 @@ impl<'a> Scheduler<'a> {
             &self.results,
             self.options.sort_order_speed_comparison,
         ) {
+            fn get_command_from_result<'b>(result: &'b BenchmarkResult) -> &'b str {
+                if !result.command_with_unused_parameters.is_empty() {
+                    &result.command_with_unused_parameters
+                } else {
+                    &result.command
+                }
+            }
+
             match self.options.sort_order_speed_comparison {
                 SortOrder::MeanTime => {
                     println!("{}", "Summary".bold());
@@ -78,7 +87,7 @@ impl<'a> Scheduler<'a> {
 
                     println!(
                         "  {} ran",
-                        fastest.result.command_with_unused_parameters.cyan()
+                        (get_command_from_result(&fastest.result)).cyan()
                     );
 
                     for item in others {
@@ -90,7 +99,8 @@ impl<'a> Scheduler<'a> {
                             } else {
                                 "".into()
                             },
-                            &item.result.command_with_unused_parameters.magenta()
+                            // &item.result.command_with_unused_parameters.magenta()
+                            &(get_command_from_result(&item.result)).magenta()
                         );
                     }
                 }
@@ -108,7 +118,7 @@ impl<'a> Scheduler<'a> {
                             } else {
                                 "        ".into()
                             },
-                            &item.result.command_with_unused_parameters,
+                            &(get_command_from_result(item.result)),
                         );
                     }
                 }
diff --git a/src/cli.rs b/src/cli.rs
index cc924cb..77e77e5 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -283,6 +283,13 @@ fn build_command() -> Command {
                 .help("Export the timing summary statistics and timings of individual runs as JSON to the given FILE. \
                        The output time unit is always seconds"),
         )
+        .arg(
+            Arg::new("import-json")
+                .long("import-json")
+                .action(ArgAction::Set)
+                .value_name("FILE")
+                .help("Import the timing summary statistics and timings of individual runs from a JSON  FILE.")
+        )
         .arg(
             Arg::new("export-markdown")
                 .long("export-markdown")
diff --git a/src/export/json.rs b/src/export/json.rs
index d2542c1..27c7d83 100644
--- a/src/export/json.rs
+++ b/src/export/json.rs
@@ -8,9 +8,9 @@ use crate::util::units::Unit;
 
 use anyhow::Result;
 
-#[derive(Serialize, Debug)]
-struct HyperfineSummary<'a> {
-    results: &'a [BenchmarkResult],
+#[derive(Serialize, Deserialize, Debug)]
+pub struct HyperfineSummary {
+    pub results: Vec<BenchmarkResult>,
 }
 
 #[derive(Default)]
@@ -23,7 +23,9 @@ impl Exporter for JsonExporter {
         _unit: Option<Unit>,
         _sort_order: SortOrder,
     ) -> Result<Vec<u8>> {
-        let mut output = to_vec_pretty(&HyperfineSummary { results });
+        let mut output = to_vec_pretty(&HyperfineSummary {
+            results: results.to_vec(),
+        });
         if let Ok(ref mut content) = output {
             content.push(b'\n');
         }
diff --git a/src/export/mod.rs b/src/export/mod.rs
index 4fdab0c..c00ab09 100644
--- a/src/export/mod.rs
+++ b/src/export/mod.rs
@@ -3,7 +3,7 @@ use std::io::Write;
 
 mod asciidoc;
 mod csv;
-mod json;
+pub mod json;
 mod markdown;
 mod markup;
 mod orgmode;
diff --git a/src/import.rs b/src/import.rs
new file mode 100644
index 0000000..34e50c4
--- /dev/null
+++ b/src/import.rs
@@ -0,0 +1,31 @@
+use crate::{benchmark::benchmark_result::BenchmarkResult, export::json::HyperfineSummary};
+use clap::ArgMatches;
+use std::fs;
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct Importer {}
+
+impl Importer {
+    pub fn from_cli_arguments(matches: &ArgMatches) -> Option<Vec<BenchmarkResult>> {
+        match matches.get_one::<String>("import-json") {
+            Some(file_name) => read_summary_from_file(file_name),
+            None => None,
+        }
+    }
+}
+
+fn read_summary_from_file(file_name: &str) -> Option<Vec<BenchmarkResult>> {
+    let file_content = match fs::read_to_string(file_name) {
+        Ok(content) => content,
+        Err(_) => {
+            eprintln!("Unable to load previous run from file {}", file_name);
+            return None;
+        }
+    };
+
+    let hyperfine_summary = serde_json::from_str::<HyperfineSummary>(&file_content);
+    match hyperfine_summary {
+        Ok(summary) => Some(summary.results),
+        Err(_) => None,
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index a75d4bd..b5f259a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -9,6 +9,7 @@ use benchmark::scheduler::Scheduler;
 use cli::get_cli_arguments;
 use command::Commands;
 use export::ExportManager;
+use import::Importer;
 use options::Options;
 
 use anyhow::Result;
@@ -19,6 +20,7 @@ pub mod cli;
 pub mod command;
 pub mod error;
 pub mod export;
+pub mod import;
 pub mod options;
 pub mod outlier_detection;
 pub mod output;
@@ -32,13 +34,15 @@ fn run() -> Result<()> {
     colored::control::set_virtual_terminal(true).unwrap();
 
     let cli_arguments = get_cli_arguments(env::args_os());
+    let previous_results = Importer::from_cli_arguments(&cli_arguments).unwrap_or(Vec::new());
+
     let options = Options::from_cli_arguments(&cli_arguments)?;
     let commands = Commands::from_cli_arguments(&cli_arguments)?;
     let export_manager = ExportManager::from_cli_arguments(&cli_arguments, options.time_unit)?;
 
     options.validate_against_command_list(&commands)?;
 
-    let mut scheduler = Scheduler::new(&commands, &options, &export_manager);
+    let mut scheduler = Scheduler::new(&commands, &options, &export_manager, &previous_results);
     scheduler.run_benchmarks()?;
     scheduler.print_relative_speed_comparison();
     scheduler.final_export()?;